kcm/kwinrules: Add hint about ignore geometry
Some applications set their own geometry after starting, which overrides the initial rules size & pos settings.
This happens now more often, after introducing the "Remember app last position" feature for KXMLgui apps.
There is a mechanism to avoid that, by Forcing the rule property "Ignore geometry", but it is unknown to many users.
This MR shows a hint when the conditions are met, so users can set this property and hopefully avoid bug reports.
| Showing Hint | Suggestion applied | Hint list |
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