fixed PY-11595 Unable to move lines within Python doc strings
regionMatches insteadof substring
 if IDEA sees text/plain and extension .java, perhaps it should infer that it's actually Java, because not everyone will set up their HTTP servers with language-specific mime types? (Particularly when following a URL to a source file in a sourcemap.) +review
IDEA-35996 Ant integration: provide more informative message in case ant file execution is stopped due to unknown command line argument
Style

*StringUtil methods used  instead of String internal methods;
*annotations added;
*unnecessary hgFile removed from contained in branches method
fixed PY-11594 New Project: selected interpreter is not set as project interpreter when attaching project to already opened one
fix and improve intention description
Merge remote-tracking branch 'origin/master'
test updated