[patch] more sesponsive file search dialog

[Jindrich Makovicka]

Hello,

Currently, during the file content search, no events are checked, which 
is very annoying when mc hits a big file and the UI freezes. This patch 
adds event checks to the code for searching the file contents.
After applying, the Find File dialog works all the time during the 
search, so the searching can be stopped or suspended&resumed even in the 
middle of a file. For suspend&resume, the code is modified to make sure 
the search will continue where it previously ended.

This is about third time I try to submit this patch and hope it could be 
finally included in some form.

Regards,
-- 
Jindrich Makovicka
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