Re-introduction of the feature to adjust the line spacing

This already has been implemented in change
dc64f3207b, but was reverted with
change f220cb0e23) because this does not
work with text wrapping rendering, due to internal limitations of Qt.
Since this is a highly requested feature (e.g. QTCREATORBUG-13727), but
an internal change within Qt is not in sight, the approach taken here
is to offer the text wrapping feature in the settings only when the
line spacing is set to 100%. Additionally, a change has been made to
the layout of the display settings page to reflect this.

Fixes: QTCREATORBUG-13727
Change-Id: Ib233cf90a5f336bc591fa1bf860e162fa774dfe3
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/fakevim/fakevimplugin.cpp

@@ -306,7 +306,7 @@ private:
     {
         QTextCursor tc = m_editor->textCursor();
         m_currentPos = tc.position();
-        m_lineSpacing = m_editor->cursorRect(tc).height();
+        m_lineSpacing = m_editor->document()->documentLayout()->blockBoundingRect(tc.block()).height();
         setFont(m_editor->extraArea()->font());
 
         // Follow geometry of normal line numbers if visible,

src/plugins/texteditor/displaysettingspage.cpp

@@ -10,11 +10,13 @@
 
 #include <coreplugin/icore.h>
 
+
 #include <utils/layoutbuilder.h>
 
 #include <QApplication>
 #include <QCheckBox>
 #include <QGroupBox>
+#include <QLabel>
 #include <QRadioButton>
 #include <QSpinBox>
 
@@ -46,6 +48,31 @@ public:
         resize(452, 458);
 
         enableTextWrapping = new QCheckBox(tr("Enable text &wrapping"));
+
+        enableTextWrappingHintLabel = new QLabel(tr("<i>Set <a href=\"font zoom\">font line spacing</a> "
+                                                    "to 100% to enable text wrapping option.</i>"));
+
+        fontSettingsPageLineSpacing = fontSettingsPageLineSpacingLink();
+
+        if (fontSettingsPageLineSpacing) {
+            connect(fontSettingsPageLineSpacing, QOverload<int>::of(&QSpinBox::valueChanged),
+                [=](const int &value) {
+                    if (value != 100)
+                        enableTextWrapping->setChecked(false);
+                    enableTextWrapping->setEnabled(value == 100);
+                    enableTextWrappingHintLabel->setVisible(value != 100); } );
+
+            if (fontSettingsPageLineSpacing->value() != 100)
+                enableTextWrapping->setChecked(false);
+
+            enableTextWrapping->setEnabled(fontSettingsPageLineSpacing->value() == 100);
+            enableTextWrappingHintLabel->setVisible(fontSettingsPageLineSpacing->value() != 100);
+        }
+
+        connect(enableTextWrappingHintLabel, &QLabel::linkActivated, []() {
+            Core::ICore::showOptionsDialog(Constants::TEXT_EDITOR_FONT_SETTINGS); } );
+
+
         showWrapColumn = new QCheckBox(tr("Display right &margin at column:"));
         tintMarginArea = new QCheckBox(tr("Tint whole margin area"));
 
@@ -98,13 +125,19 @@ public:
 
         Column {
             Group {
-                title(tr("Text Wrapping")),
+                title(tr("Margin")),
                 Column {
-                    enableTextWrapping,
+                    Row { showWrapColumn, wrapColumn, st },
-                    Row { showWrapColumn, wrapColumn, useIndenter, tintMarginArea, st }
+                    Row { useIndenter, tintMarginArea, st }
+                }
+            },
+            Group {
+                title(tr("Wrapping")),
+                Column {
+                    enableTextWrapping,
+                    Row { enableTextWrappingHintLabel, st}
                 }
             },
-
             Group {
                 title(tr("Display")),
                 Row {
@@ -145,9 +178,12 @@ public:
     void settingsToUI();
     void setDisplaySettings(const DisplaySettings &, const MarginSettings &newMarginSettings);
 
+    QSpinBox *fontSettingsPageLineSpacingLink();
+
     DisplaySettingsPagePrivate *m_data = nullptr;
 
     QCheckBox *enableTextWrapping;
+    QLabel *enableTextWrappingHintLabel;
     QCheckBox *showWrapColumn;
     QCheckBox *tintMarginArea;
     QSpinBox *wrapColumn;
@@ -173,6 +209,8 @@ public:
     QRadioButton *atMargin;
     QRadioButton *rightAligned;
     QRadioButton *betweenLines;
+
+    QSpinBox *fontSettingsPageLineSpacing = nullptr;
 };
 
 void DisplaySettingsWidget::apply()
@@ -189,6 +227,10 @@ void DisplaySettingsWidget::settingsFromUI(DisplaySettings &displaySettings,
 {
     displaySettings.m_displayLineNumbers = displayLineNumbers->isChecked();
     displaySettings.m_textWrapping = enableTextWrapping->isChecked();
+    if (fontSettingsPageLineSpacing) {
+        if (fontSettingsPageLineSpacing->value() != 100)
+            displaySettings.m_textWrapping = false;
+    }
     marginSettings.m_showMargin = showWrapColumn->isChecked();
     marginSettings.m_tintMarginArea = tintMarginArea->isChecked();
     marginSettings.m_useIndenter = useIndenter->isChecked();
@@ -281,6 +323,23 @@ void DisplaySettingsWidget::setDisplaySettings(const DisplaySettings &newDisplay
     }
 }
 
+ QSpinBox *DisplaySettingsWidget::fontSettingsPageLineSpacingLink()
+ {
+     for (const auto &page : Core::IOptionsPage::allOptionsPages()) {
+         QWidget *widget = page->widget();
+
+         if (!widget)
+             continue;
+
+         for (QSpinBox *spinBox : widget->findChildren<QSpinBox *>()) {
+             if (spinBox->objectName() == QLatin1String("FontSettingsPage.LineSpacingSpinBox"))
+                return spinBox;
+         }
+     }
+
+     return nullptr;
+ }
+
 DisplaySettingsPage::DisplaySettingsPage()
   : d(new DisplaySettingsPagePrivate)
 {

src/plugins/texteditor/fontsettings.cpp

@@ -23,6 +23,7 @@
 static const char fontFamilyKey[] = "FontFamily";
 static const char fontSizeKey[] = "FontSize";
 static const char fontZoomKey[] = "FontZoom";
+static const char lineSpacingKey[] = "LineSpacing";
 static const char antialiasKey[] = "FontAntialias";
 static const char schemeFileNamesKey[] = "ColorSchemes";
 
@@ -38,7 +39,9 @@ FontSettings::FontSettings() :
     m_family(defaultFixedFontFamily()),
     m_fontSize(defaultFontSize()),
     m_fontZoom(100),
-    m_antialias(DEFAULT_ANTIALIAS)
+    m_lineSpacing(100),
+    m_antialias(DEFAULT_ANTIALIAS),
+    m_lineSpacingCache(0)
 {
 }
 
@@ -47,10 +50,10 @@ void FontSettings::clear()
     m_family = defaultFixedFontFamily();
     m_fontSize = defaultFontSize();
     m_fontZoom = 100;
+    m_lineSpacing = 100;
     m_antialias = DEFAULT_ANTIALIAS;
     m_scheme.clear();
-    m_formatCache.clear();
+    clearCaches();
-    m_textCharFormatCache.clear();
 }
 
 static QString settingsGroup()
@@ -70,6 +73,9 @@ void FontSettings::toSettings(QSettings *s) const
     if (m_fontZoom!= 100 || s->contains(QLatin1String(fontZoomKey)))
         s->setValue(QLatin1String(fontZoomKey), m_fontZoom);
 
+    if (m_lineSpacing != 100 || s->contains(QLatin1String(lineSpacingKey)))
+        s->setValue(QLatin1String(lineSpacingKey), m_lineSpacing);
+
     if (m_antialias != DEFAULT_ANTIALIAS || s->contains(QLatin1String(antialiasKey)))
         s->setValue(QLatin1String(antialiasKey), m_antialias);
 
@@ -95,6 +101,7 @@ bool FontSettings::fromSettings(const FormatDescriptions &descriptions, const QS
     m_family = s->value(group + QLatin1String(fontFamilyKey), defaultFixedFontFamily()).toString();
     m_fontSize = s->value(group + QLatin1String(fontSizeKey), m_fontSize).toInt();
     m_fontZoom= s->value(group + QLatin1String(fontZoomKey), m_fontZoom).toInt();
+    m_lineSpacing = s->value(group + QLatin1String(lineSpacingKey), m_lineSpacing).toInt();
     m_antialias = s->value(group + QLatin1String(antialiasKey), DEFAULT_ANTIALIAS).toBool();
 
     if (s->contains(group + QLatin1String(schemeFileNamesKey))) {
@@ -114,6 +121,7 @@ bool FontSettings::equals(const FontSettings &f) const
     return m_family == f.m_family
             && m_schemeFileName == f.m_schemeFileName
             && m_fontSize == f.m_fontSize
+            && m_lineSpacing == f.m_lineSpacing
             && m_fontZoom == f.m_fontZoom
             && m_antialias == f.m_antialias
             && m_scheme == f.m_scheme;
@@ -250,6 +258,13 @@ void FontSettings::addMixinStyle(QTextCharFormat &textCharFormat,
     };
 }
 
+void FontSettings::clearCaches()
+{
+    m_formatCache.clear();
+    m_textCharFormatCache.clear();
+    m_lineSpacingCache = 0;
+}
+
 QTextCharFormat FontSettings::toTextCharFormat(TextStyles textStyles) const
 {
     auto textCharFormatIterator = m_textCharFormatCache.find(textStyles);
@@ -290,8 +305,7 @@ QString FontSettings::family() const
 void FontSettings::setFamily(const QString &family)
 {
     m_family = family;
-    m_formatCache.clear();
+    clearCaches();
-    m_textCharFormatCache.clear();
 }
 
 /**
@@ -305,8 +319,7 @@ int FontSettings::fontSize() const
 void FontSettings::setFontSize(int size)
 {
     m_fontSize = size;
-    m_formatCache.clear();
+    clearCaches();
-    m_textCharFormatCache.clear();
 }
 
 /**
@@ -320,8 +333,33 @@ int FontSettings::fontZoom() const
 void FontSettings::setFontZoom(int zoom)
 {
     m_fontZoom = zoom;
-    m_formatCache.clear();
+    clearCaches();
-    m_textCharFormatCache.clear();
+}
+
+qreal FontSettings::lineSpacing() const
+{
+    if (m_lineSpacing == 100) {
+        QFontMetricsF fm(font());
+        return fm.lineSpacing();
+    }
+
+    if (qFuzzyIsNull(m_lineSpacingCache)) {
+      auto currentFont = font();
+      currentFont.setPointSize(m_fontSize * m_fontZoom / 100);
+      m_lineSpacingCache = QFontMetricsF(currentFont).lineSpacing() / 100 * m_lineSpacing;
+    }
+    return m_lineSpacingCache;
+}
+
+int FontSettings::relativeLineSpacing() const
+{
+    return m_lineSpacing;
+}
+
+void FontSettings::setRelativeLineSpacing(int relativeLineSpacing)
+{
+    m_lineSpacing = relativeLineSpacing;
+    m_lineSpacingCache = 0;
 }
 
 QFont FontSettings::font() const
@@ -342,8 +380,7 @@ bool FontSettings::antialias() const
 void FontSettings::setAntialias(bool antialias)
 {
     m_antialias = antialias;
-    m_formatCache.clear();
+    clearCaches();
-    m_textCharFormatCache.clear();
 }
 
 /**
@@ -380,8 +417,8 @@ void FontSettings::setColorSchemeFileName(const QString &fileName)
 bool FontSettings::loadColorScheme(const QString &fileName,
                                    const FormatDescriptions &descriptions)
 {
-    m_formatCache.clear();
+    clearCaches();
-    m_textCharFormatCache.clear();
+
     bool loaded = true;
     m_schemeFileName = fileName;
 
@@ -445,8 +482,7 @@ const ColorScheme &FontSettings::colorScheme() const
 void FontSettings::setColorScheme(const ColorScheme &scheme)
 {
     m_scheme = scheme;
-    m_formatCache.clear();
+    clearCaches();
-    m_textCharFormatCache.clear();
 }
 
 static QString defaultFontFamily()

src/plugins/texteditor/fontsettings.h

@@ -53,6 +53,10 @@ public:
     int fontZoom() const;
     void setFontZoom(int zoom);
 
+    qreal lineSpacing() const;
+    int relativeLineSpacing() const;
+    void setRelativeLineSpacing(int relativeLineSpacing);
+
     QFont font() const;
 
     bool antialias() const;
@@ -81,16 +85,19 @@ public:
 
 private:
     void addMixinStyle(QTextCharFormat &textCharFormat, const MixinTextStyles &mixinStyles) const;
+    void clearCaches();
 
 private:
     QString m_family;
     QString m_schemeFileName;
     int m_fontSize;
     int m_fontZoom;
+    int m_lineSpacing;
     bool m_antialias;
     ColorScheme m_scheme;
     mutable QHash<TextStyle, QTextCharFormat> m_formatCache;
     mutable QHash<TextStyles, QTextCharFormat> m_textCharFormatCache;
+    mutable qreal m_lineSpacingCache;
 };
 
 } // namespace TextEditor

src/plugins/texteditor/fontsettingspage.cpp

@@ -15,6 +15,7 @@
 #include <utils/qtcassert.h>
 #include <utils/stringutils.h>
 #include <utils/theme/theme.h>
+#include <utils/utilsicons.h>
 
 #include <QAbstractItemModel>
 #include <QDebug>
@@ -124,6 +125,19 @@ public:
         m_zoomSpinBox->setSingleStep(10);
         m_zoomSpinBox->setValue(m_value.fontZoom());
 
+        m_lineSpacingSpinBox = new QSpinBox;
+        m_lineSpacingSpinBox->setObjectName(QLatin1String("FontSettingsPage.LineSpacingSpinBox"));
+        m_lineSpacingSpinBox->setSuffix(tr("%"));
+        m_lineSpacingSpinBox->setRange(50, 3000);
+        m_lineSpacingSpinBox->setValue(m_value.relativeLineSpacing());
+
+        m_lineSpacingWarningLabel = new QLabel;
+        m_lineSpacingWarningLabel->setPixmap(Utils::Icons::WARNING.pixmap());
+        m_lineSpacingWarningLabel->setToolTip(tr("A line spacing value other than 100% disables "
+                                                 "text wrapping.\nA value less than 100% can result "
+                                                 "in overlapping and misaligned graphics."));
+        m_lineSpacingWarningLabel->setVisible(m_value.relativeLineSpacing() != 100);
+
         m_fontComboBox = new QFontComboBox;
         m_fontComboBox->setCurrentFont(m_value.family());
 
@@ -159,7 +173,8 @@ public:
                     Row {
                         tr("Family:"), m_fontComboBox, Space(20),
                         tr("Size:"), m_sizeComboBox, Space(20),
-                        tr("Zoom:"), m_zoomSpinBox, st
+                        tr("Zoom:"), m_zoomSpinBox, Space(20),
+                        tr("Line spacing:"), m_lineSpacingSpinBox, m_lineSpacingWarningLabel, st
                     },
                     m_antialias
                 }
@@ -183,6 +198,8 @@ public:
                 this, &FontSettingsPageWidget::fontZoomChanged);
         connect(m_antialias, &QCheckBox::toggled,
                 this, &FontSettingsPageWidget::antialiasChanged);
+        connect(m_lineSpacingSpinBox, QOverload<int>::of(&QSpinBox::valueChanged),
+                this, &FontSettingsPageWidget::lineSpacingChanged);
         connect(m_schemeComboBox, &QComboBox::currentIndexChanged,
                 this, &FontSettingsPageWidget::colorSchemeSelected);
         connect(m_copyButton, &QPushButton::clicked,
@@ -207,6 +224,7 @@ public:
     void fontSelected(const QFont &font);
     void fontSizeSelected(int index);
     void fontZoomChanged();
+    void lineSpacingChanged(const int &value);
     void antialiasChanged();
     void colorSchemeSelected(int index);
     void openCopyColorSchemeDialog();
@@ -230,6 +248,8 @@ public:
 
     QCheckBox *m_antialias;
     QSpinBox *m_zoomSpinBox;
+    QSpinBox *m_lineSpacingSpinBox;
+    QLabel *m_lineSpacingWarningLabel;
     QFontComboBox *m_fontComboBox;
     QComboBox *m_sizeComboBox;
     QComboBox *m_schemeComboBox;
@@ -478,6 +498,12 @@ void FontSettingsPageWidget::antialiasChanged()
     m_schemeEdit->setBaseFont(m_value.font());
 }
 
+void FontSettingsPageWidget::lineSpacingChanged(const int &value)
+{
+    m_value.setRelativeLineSpacing(value);
+    m_lineSpacingWarningLabel->setVisible(value != 100);
+}
+
 void FontSettingsPageWidget::colorSchemeSelected(int index)
 {
     bool readOnly = true;

src/plugins/texteditor/textdocumentlayout.cpp

@@ -2,7 +2,9 @@
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
 
 #include "textdocumentlayout.h"
+#include "fontsettings.h"
 #include "textdocument.h"
+#include "texteditorsettings.h"
 #include <utils/qtcassert.h>
 #include <QDebug>
 
@@ -633,6 +635,13 @@ void TextDocumentLayout::requestUpdateNow()
 QRectF TextDocumentLayout::blockBoundingRect(const QTextBlock &block) const
 {
     QRectF boundingRect = QPlainTextDocumentLayout::blockBoundingRect(block);
+
+    if (TextEditorSettings::fontSettings().relativeLineSpacing() != 100) {
+        if (boundingRect.isNull())
+            return boundingRect;
+        boundingRect.setHeight(TextEditorSettings::fontSettings().lineSpacing());
+    }
+
     if (TextBlockUserData *userData = textUserData(block))
         boundingRect.adjust(0, 0, 0, userData->additionalAnnotationHeight());
     return boundingRect;

src/plugins/texteditor/texteditor.cpp

@@ -1227,6 +1227,12 @@ static int foldBoxWidth(const QFontMetrics &fm)
     return lineSpacing + lineSpacing % 2 + 1;
 }
 
+static int foldBoxWidth()
+{
+    const int lineSpacing = TextEditorSettings::fontSettings().lineSpacing();
+    return lineSpacing + lineSpacing % 2 + 1;
+}
+
 static void printPage(int index, QPainter *painter, const QTextDocument *doc,
                       const QRectF &body, const QRectF &titleBox,
                       const QString &title)
@@ -3657,10 +3663,18 @@ QRect TextEditorWidgetPrivate::foldBox()
     QRectF br = q->blockBoundingGeometry(begin).translated(q->contentOffset());
     QRectF er = q->blockBoundingGeometry(end).translated(q->contentOffset());
 
+
+    if (TextEditorSettings::fontSettings().relativeLineSpacing() == 100) {
         return QRect(m_extraArea->width() - foldBoxWidth(q->fontMetrics()),
                      int(br.top()),
                      foldBoxWidth(q->fontMetrics()),
                      int(er.bottom() - br.top()));
+    }
+
+    return QRect(m_extraArea->width() - foldBoxWidth(),
+                 int(br.top()),
+                 foldBoxWidth(),
+                 int(er.bottom() - br.top()));
 }
 
 QTextBlock TextEditorWidgetPrivate::foldedBlockAt(const QPoint &pos, QRect *box) const
@@ -3950,7 +3964,15 @@ bool TextEditorWidgetPrivate::updateAnnotationBounds(TextBlockUserData *blockUse
 {
     const bool additionalHeightNeeded = annotationsVisible
             && m_displaySettings.m_annotationAlignment == AnnotationAlignment::BetweenLines;
-    const int additionalHeight = additionalHeightNeeded ? q->fontMetrics().lineSpacing() : 0;
+
+    int additionalHeight = 0;
+    if (additionalHeightNeeded) {
+        if (TextEditorSettings::fontSettings().relativeLineSpacing() == 100)
+            additionalHeight = q->fontMetrics().lineSpacing();
+        else
+            TextEditorSettings::fontSettings().lineSpacing();
+    }
+
     if (blockUserData->additionalAnnotationHeight() == additionalHeight)
         return false;
     blockUserData->setAdditionalAnnotationHeight(additionalHeight);
@@ -3991,7 +4013,13 @@ void TextEditorWidgetPrivate::updateLineAnnotation(const PaintEventData &data,
         return mark1->priority() > mark2->priority();
     });
 
-    const qreal itemOffset = q->fontMetrics().lineSpacing();
+    qreal itemOffset = 0.0;
+    if (TextEditorSettings::fontSettings().relativeLineSpacing() == 100)
+        itemOffset = q->fontMetrics().lineSpacing();
+    else
+        itemOffset = blockData.boundingRect.height();
+
+
     const qreal initialOffset = m_displaySettings.m_annotationAlignment == AnnotationAlignment::BetweenLines ? itemOffset / 2 : itemOffset * 2;
     const qreal minimalContentWidth = q->fontMetrics().horizontalAdvance('X')
             * m_displaySettings.m_minimalAnnotationContent;
@@ -4821,7 +4849,10 @@ int TextEditorWidget::extraAreaWidth(int *markWidthPtr) const
     int markWidth = 0;
 
     if (d->m_marksVisible) {
+        if (TextEditorSettings::fontSettings().relativeLineSpacing() == 100)
             markWidth += fm.lineSpacing() + 2;
+        else
+            markWidth += TextEditorSettings::fontSettings().lineSpacing() + 2;
 
 //     if (documentLayout->doubleMarkCount)
 //         markWidth += fm.lineSpacing() / 3;
@@ -4835,8 +4866,12 @@ int TextEditorWidget::extraAreaWidth(int *markWidthPtr) const
 
     space += 4;
 
-    if (d->m_codeFoldingVisible)
+    if (d->m_codeFoldingVisible) {
+        if (TextEditorSettings::fontSettings().relativeLineSpacing() == 100)
             space += foldBoxWidth(fm);
+        else
+            space += foldBoxWidth();
+    }
 
     if (viewportMargins() != QMargins{isLeftToRight() ? space : 0, 0, isLeftToRight() ? 0 : space, 0})
         d->slotUpdateExtraAreaWidth(space);
@@ -4870,6 +4905,11 @@ struct Internal::ExtraAreaPaintEventData
               editor->textDocument()->fontSettings().toTextCharFormat(C_CURRENT_LINE_NUMBER))
         , palette(d->m_extraArea->palette())
     {
+        if (TextEditorSettings::fontSettings().relativeLineSpacing() != 100) {
+            lineSpacing = TextEditorSettings::fontSettings().lineSpacing();
+            collapseColumnWidth = d->m_codeFoldingVisible ? foldBoxWidth() : 0;
+            markWidth = d->m_marksVisible ? lineSpacing : 0;
+        }
         palette.setCurrentColorGroup(QPalette::Active);
     }
     QTextBlock block;
@@ -4878,9 +4918,9 @@ struct Internal::ExtraAreaPaintEventData
     const int selectionStart;
     const int selectionEnd;
     const QFontMetrics fontMetrics;
-    const int lineSpacing;
+    int lineSpacing;
-    const int markWidth;
+    int markWidth;
-    const int collapseColumnWidth;
+    int collapseColumnWidth;
     const int extraAreaWidth;
     const QTextCharFormat currentLineNumberFormat;
     QPalette palette;
@@ -5029,7 +5069,12 @@ void TextEditorWidgetPrivate::paintCodeFolding(QPainter &painter,
     bool hovered = blockNumber >= extraAreaHighlightFoldBlockNumber
             && blockNumber <= extraAreaHighlightFoldEndBlockNumber;
 
-    int boxWidth = foldBoxWidth(data.fontMetrics);
+    int boxWidth = 0;
+    if (TextEditorSettings::fontSettings().relativeLineSpacing() == 100)
+        boxWidth = foldBoxWidth(data.fontMetrics);
+    else
+        boxWidth = foldBoxWidth();
+
     if (hovered) {
         int itop = qRound(blockBoundingRect.top());
         int ibottom = qRound(blockBoundingRect.bottom());
@@ -5725,7 +5770,13 @@ void TextEditorWidget::updateFoldingHighlight(const QPoint &pos)
     const int highlightBlockNumber = d->extraAreaHighlightFoldedBlockNumber;
     d->extraAreaHighlightFoldedBlockNumber = -1;
 
-    if (pos.x() > extraArea()->width() - foldBoxWidth(fontMetrics())) {
+    int boxWidth = 0;
+    if (TextEditorSettings::fontSettings().relativeLineSpacing() == 100)
+        boxWidth = foldBoxWidth(fontMetrics());
+    else
+        boxWidth = foldBoxWidth();
+
+    if (pos.x() > extraArea()->width() - boxWidth) {
         d->extraAreaHighlightFoldedBlockNumber = cursor.blockNumber();
     } else if (d->m_displaySettings.m_highlightBlocks) {
         QTextCursor cursor = textCursor();
@@ -5785,7 +5836,11 @@ void TextEditorWidget::extraAreaMouseEvent(QMouseEvent *e)
 
     if (e->type() == QEvent::MouseButtonPress || e->type() == QEvent::MouseButtonDblClick) {
         if (e->button() == Qt::LeftButton) {
-            int boxWidth = foldBoxWidth(fontMetrics());
+            int boxWidth = 0;
+            if (TextEditorSettings::fontSettings().relativeLineSpacing() == 100)
+                boxWidth = foldBoxWidth(fontMetrics());
+            else
+                boxWidth = foldBoxWidth();
             if (d->m_codeFoldingVisible && e->pos().x() > extraArea()->width() - boxWidth) {
                 if (!cursor.block().next().isVisible()) {
                     d->toggleBlockVisible(cursor.block());
@@ -6330,7 +6385,7 @@ void TextEditorWidgetPrivate::adjustScrollBarRanges()
 {
     if (!m_highlightScrollBarController)
         return;
-    const double lineSpacing = QFontMetricsF(q->font()).lineSpacing();
+    const double lineSpacing = TextEditorSettings::fontSettings().lineSpacing();
     if (lineSpacing == 0)
         return;
 
@@ -7320,7 +7375,15 @@ void TextEditorWidget::applyFontSettings()
 
 void TextEditorWidget::setDisplaySettings(const DisplaySettings &ds)
 {
+    const TextEditor::FontSettings &fs = TextEditorSettings::fontSettings();
+    if (fs.relativeLineSpacing() == 100)
         setLineWrapMode(ds.m_textWrapping ? QPlainTextEdit::WidgetWidth : QPlainTextEdit::NoWrap);
+    else
+        setLineWrapMode(QPlainTextEdit::NoWrap);
+
+    QTC_ASSERT((fs.relativeLineSpacing() == 100) || (fs.relativeLineSpacing() != 100
+        && lineWrapMode() == QPlainTextEdit::NoWrap), setLineWrapMode(QPlainTextEdit::NoWrap));
+
     setLineNumbersVisible(ds.m_displayLineNumbers);
     setHighlightCurrentLine(ds.m_highlightCurrentLine);
     setRevisionsVisible(ds.m_markTextChanges);

src/plugins/texteditor/texteditoractionhandler.cpp

@@ -5,9 +5,11 @@
 
 #include "texteditor.h"
 #include "displaysettings.h"
+#include "fontsettings.h"
 #include "linenumberfilter.h"
 #include "texteditorconstants.h"
 #include "texteditorplugin.h"
+#include "texteditorsettings.h"
 
 #include <aggregation/aggregate.h>
 
@@ -134,6 +136,8 @@ TextEditorActionHandlerPrivate::TextEditorActionHandlerPrivate
     createActions();
     connect(Core::EditorManager::instance(), &Core::EditorManager::currentEditorChanged,
         this, &TextEditorActionHandlerPrivate::updateCurrentEditor);
+    connect(TextEditorSettings::instance(), &TextEditorSettings::fontSettingsChanged,
+        this, &TextEditorActionHandlerPrivate::updateActions);
 }
 
 void TextEditorActionHandlerPrivate::createActions()
@@ -448,7 +452,12 @@ void TextEditorActionHandlerPrivate::updateActions()
         a->setEnabled(isWritable);
     m_unCommentSelectionAction->setEnabled((m_optionalActions & TextEditorActionHandler::UnCommentSelection) && isWritable);
     m_visualizeWhitespaceAction->setEnabled(m_currentEditorWidget);
+    if (TextEditorSettings::fontSettings().relativeLineSpacing() == 100) {
         m_textWrappingAction->setEnabled(m_currentEditorWidget);
+    } else {
+        m_textWrappingAction->setEnabled(false);
+        m_textWrappingAction->setChecked(false);
+    }
     if (m_currentEditorWidget) {
         m_visualizeWhitespaceAction->setChecked(
                     m_currentEditorWidget->displaySettings().m_visualizeWhitespace);