Add way for plugin to specify label for quick open
Merge with master
Made optional arg handling more consistent in Quick Open plugin API
Clean up various dialog label code paths. Don't set the label before the first call to filter.
Allow plugins that don't care about language to work when no documents are open
fix 5742: It should pop up Error opening file dialog if click the image which is deleted from OS.
Updated by ALF automation.
Merge remote-tracking branch 'upstream/master'
refactor to share directory searching code used by working set
increment i before comparing with array length
Merge branch 'master' into couzteau/fix-5742-Error-on-deleted-img

Conflicts:
	src/editor/ImageViewer.js
add isBinary to language def
Merge remote-tracking branch 'upstream/master'
Fix coordinates tip flickering and incorrect coordinates calculation.
#5800 fix
enable file extensions for binary file types
Spanish translations for sprint34
Samples cleanup
Last missing sprint34 strings
review feedback - removed the need for  ImageViewer or other CustomViewers to display a warning when an image is renamed or deleted while viewed.