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Editor: Fix crash when removing mark from the block data destructor.

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The TextBlockUserData is destructed from QTextBlockData::free which
deletes the layout right before. So triggering a direct update from
within this destructor could result in a crash when the already deleted
layout is used.

Task-number: QTCREATORBUG-16046
Change-Id: Ifd1d4334ba8ef47c41e0b9ae078ceaf1112b5908
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>
This commit is contained in:
David Schulz
2016-04-11 10:18:30 +02:00
parent 4e0b55f673
commit 1a5ebfbe05
1 changed files with 9 additions and 2 deletions
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11
src/plugins/texteditor/textdocument.cpp
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@@ -48,6 +48,7 @@
#include <QScrollBar>
#include <QStringList>
#include <QTextCodec>
#include <QTimer>
#include <coreplugin/coreconstants.h>
#include <coreplugin/icore.h>
@@ -852,10 +853,16 @@ void TextDocument::removeMarkFromMarksCache(TextMark *mark)
QTC_ASSERT(documentLayout, return);
d->m_marksCache.removeAll(mark);
auto scheduleLayoutUpdate = [documentLayout](){
// make sure all destructors that may directly or indirectly call this function are
// completed before updating.
QTimer::singleShot(0, documentLayout, &QPlainTextDocumentLayout::requestUpdate);
};
if (d->m_marksCache.isEmpty()) {
documentLayout->hasMarks = false;
documentLayout->maxMarkWidthFactor = 1.0;
documentLayout->requestUpdate();
scheduleLayoutUpdate();
return;
}
@@ -879,7 +886,7 @@ void TextDocument::removeMarkFromMarksCache(TextMark *mark)
if (maxWidthFactor != documentLayout->maxMarkWidthFactor) {
documentLayout->maxMarkWidthFactor = maxWidthFactor;
documentLayout->requestUpdate();
scheduleLayoutUpdate();
} else {
documentLayout->requestExtraAreaUpdate();
}