[Lazarus] Redundant assigned(X) and (X is Txxx) in Laz. sources

[Vojtěch Čihák]

Hi,
 
I wrote a small routine to search Lazarus sources and it found about 60 places similar to this (taborderdlg.pas, line 398):
 
if Assigned(LookupRoot) and (LookupRoot is TWinControl) then begin
 
Should I make a patch for all occurences?
 
V.

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