fpspreadsheet: Fix deletion of columns/rows of base of shared formula is removed.

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3573 8e941d3f-bd1b-0410-a28a-d453659cc2b4
RxMDI: fix AV on close not active child window

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3574 8e941d3f-bd1b-0410-a28a-d453659cc2b4