TextEditor: Limit size of tool tips

Otherwise we may end up in crashes deep inside Qt code on Windows.

Fixes: QTCREATORBUG-26112
Change-Id: Iabdd544271a99b680adad3abb84341db2bf2c1f3
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/utils/tooltip/tooltip.cpp

@@ -155,6 +155,8 @@ void ToolTip::show(
 {
     if (content && content->count()) {
         auto tooltipWidget = new FakeToolTip;
+        // limit the size of the widget to 90% of the screen size to have some context around it
+        tooltipWidget->setMaximumSize(QGuiApplication::screenAt(pos)->availableSize() * 0.9);
         if (contextHelp.isNull()) {
             tooltipWidget->setLayout(content);
         } else {