Do not compute caret geometry when we are not ready to do so.

This avoid crashes with invalid cache.

Fixes bug #11763.

diff --git a/src/frontends/qt/GuiWorkArea.cpp b/src/frontends/qt/GuiWorkArea.cpp
index ab13c687d7c9d549299508303bea29a33371f30f..90b17bae6ca93bedce26a82c0e5f739e18f4e2ec 100644 (file)
--- a/src/frontends/qt/GuiWorkArea.cpp
+++ b/src/frontends/qt/GuiWorkArea.cpp
@@ -443,8 +443,10 @@ void GuiWorkArea::startBlinkingCaret()
        if (view().busy())
                return;
 
-       // Don't start blinking if the cursor isn't on screen.
-       if (!d->buffer_view_->caretInView())
+       // Don't start blinking if the cursor isn't on screen, unless we
+       // are not ready to know whether the cursor is on screen.
+       if (!d->buffer_view_->buffer().undo().activeUndoGroup()
+           && !d->buffer_view_->caretInView())
                return;
 
        d->showCaret();
@@ -608,7 +610,10 @@ void GuiWorkArea::Private::resizeBufferView()
 
 void GuiWorkArea::Private::updateCaretGeometry()
 {
-       if (!buffer_view_->caretInView())
+       // we cannot update geometry if not ready and we do not need to if
+       // caret is not in view.
+       if (buffer_view_->buffer().undo().activeUndoGroup()
+           || !buffer_view_->caretInView())
                return;
 
        Point point;