xtemp09 a3036d16f1 Fix the crash described in #12785 ...

Closes #12785. The cause of the segmentation fault is access to the
already deleted _QMenu_. Simple setting attribute `Qt::WA_DeleteOnClose`
and removal of `delete menu` prevented it. To reproduce the crash, one
needs to mess up the `user.cfg` file in the way described in the issue.

Here is the fragment from the issue to mess up the `user.cfg` file:

```xml
<FCParamGroup Name="Expression">
<FCText Name="EditorTrigger">=</FCText>
<FCBool Name="AntoHideEditorIcon" Value="1"/>
<FCBool Name="NoSystemBackground" Value="1"/>
<FCInt Name="EditDialogBGAlpha" Value="1"/>
<FCInt Name="EditDialogWidth" Value="300"/>
<FCInt Name="EditDialogHeight" Value="214"/>
<FCInt Name="EditDialogTextHeight" Value="35"/>
</FCParamGroup>
```

---

This commit changes also unconnected things:

- usage of `QObject::connect` instead of if statements
- relocation of a separator and an action inside the if statement (I saw
no reason to have a separator and an action for _ExpressionCompleter_ if
there is no expression completer)
- usage of asynchronous `QMenu::popup()` instead of synchronous
`QMenu::exec()`. This way is used within [the source code of Qt]
(https://github.com/qt/qtbase/blob/5.15/src/widgets/widgets/
qlineedit.cpp#L2191-L2197).

2024-03-09 16:12:47 +01:00

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