Merge branch '2520_ctrlg_closes_panels_stable' into 4.7.5-stable
* 2520_ctrlg_closes_panels_stable:
Fix of DLG_ACTION handling in 'VFS Setting' dialog window.
Fix of DLG_ACTION handling in 'Chmod' command window.
Fix of CK_DialogCancel handling in Tree widget.
Fix of DLG_ACTION handling in 'Configure options' dialog window.
Fix of DLG_ACTION handling in interactive help.
Fix of DLG_ACTION handling in diff viewer.
Fix of DLG_ACTION handling in viewer.
Fix of DLG_ACTION handling in file panels.
Ticket #2520: SIGINT generated by Ctrl-g pressing closes file panels.