LCL, grids, invalidate focused cell/row on killing/gaining focus, patch by Yuichiro Takahashi, issue 25371

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46507 4005530d-fff6-0310-9dd1-cebe43e6787f
PoChecker: use a custom made dialog for displying possibly very long list of filenames.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46508 4005530d-fff6-0310-9dd1-cebe43e6787f
Merge branch 'upstream' of https://github.com/graemeg/lazarus into lazarus-aros