So i have this weird problem under Linux with the GTK2 backend (it doesn't happen in the Qt backend): every time i click on a component button in the palette, the designed form shrinks a bit (about 30 pixels or so). This happens in the stable 1.2 version, 1.4RC and trunk. Deleting ~/.lazarus etc doesn't fix it so it isn't a settings issue.
I tried to debug it a bit by adding breakpoints in SetBounds, DoOnResize, etc but couldn't find where the resize request comes from (OnResize stuff comes from a "WM" message). What is even more weird, commenting out the OnClick code in the component palette so that it isn't handled at all, still causes it - i suspect some weird combination of GTK+ events might cause it since the buttons are still pressed. Although TBH this was mostly "shooting blind" trying to find some clue.
The only thing i suspect is the window manager i'm using, Window Maker, might not support some of the more recent window hint/style/etc stuff (although i'm using the latest version and is in active development since a few years now). Steam also seems to have trouble with interacting with wmaker, but that one implements its own widgets and it might be a bug they didn't bother to fix. Every other program i've tried seems to work fine with wmaker so i'm not sure if it is that (and besides it works fine with the Qt backend).
Does anyone have any idea what might cause this and how to fix it (no, replacing wmaker isn't an option :-P besides if it is a bug there i'll just fix wmaker)?
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