[Lazarus] Unneeded Paint calls from LCL

[AlexeyT]

Details:
Linux gtk2: LCL calls Paint 5 times for ATSynEdit on FormCreate/FormShow:

1- DoOnResize - i filtered it out
2- DoOnResize - i filtered it out
3- Paint - it's ok
4- Paint again - i cannot filter it out
5- Paint again

Win32: LCL calls Paint 3 times:

1- Paint - it's ok
2- DoOnResize - i cannot filter it out
3- DoOnResize again

Can you optimize it to call Paint once, and DoOnResize BEFORE Paint?

Alexey T.