Move MinimizableInfoBars from CppEditorDocument to IDocument

Similar to the InfoBar.

The only thing that an editor implementation needs to do is to set a
settings group and the possible info bars in the document constructor.
And later call document->minimizableInfoBars()->setInfoVisible(id,
visible) to manage the state.

Change-Id: I23afb3639b70b1bfccd424579da018280a7fe2cb
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/texteditor/texteditor.cpp

@@ -80,6 +80,7 @@
 #include <utils/hostosinfo.h>
 #include <utils/infobar.h>
 #include <utils/mimeutils.h>
+#include <utils/minimizableinfobars.h>
 #include <utils/multitextcursor.h>
 #include <utils/qtcassert.h>
 #include <utils/styledbar.h>
@@ -8534,6 +8535,12 @@ BaseTextEditor *TextEditorFactoryPrivate::createEditorHelper(const TextDocumentP
     if (m_useGenericHighlighter)
         textEditorWidget->setupGenericHighlighter();
     textEditorWidget->finalizeInitialization();
+
+    // Toolbar: Actions to show minimized info bars
+    document->minimizableInfoBars()->createShowInfoBarActions([textEditorWidget](QWidget *w) {
+        return textEditorWidget->insertExtraToolBarWidget(TextEditorWidget::Left, w);
+    });
+
     editor->finalizeInitialization();
     return editor;
 }