git-gui: Fix merge conflict display error when filename contains spaces

When a merge conflict occurs in a file with spaces in the filename,
git-gui showed wrongly "LOCAL: deleted".

Signed-off-by: Jens Lehmann <[email protected]>
Signed-off-by: Shawn O. Pearce <[email protected]>

Author: jlehmann

lib/mergetool.tcl

@@ -88,7 +88,7 @@ proc merge_load_stages {path cont} {
 	set merge_stages(3) {}
 	set merge_stages_buf {}
 
-	set merge_stages_fd [eval git_read ls-files -u -z -- $path]
+	set merge_stages_fd [eval git_read ls-files -u -z -- {$path}]
 
 	fconfigure $merge_stages_fd -blocking 0 -translation binary -encoding binary
 	fileevent $merge_stages_fd readable [list read_merge_stages $merge_stages_fd $cont]