git-gui: Add hotkeys for "Unstage from commit" and "Revert changes"

Signed-off-by: NVitaly _Vi Shukela <public_vi@tut.by>
Signed-off-by: NShawn O. Pearce <spearce@spearce.org>

git-gui.sh

@@ -2543,12 +2543,14 @@ if {[is_enabled multicommit] || [is_enabled singlecommit]} {
 		[list .mbar.commit entryconf [.mbar.commit index last] -state]
 
 	.mbar.commit add command -label [mc "Unstage From Commit"] \
-		-command do_unstage_selection
+		-command do_unstage_selection \
+		-accelerator $M1T-U
 	lappend disable_on_lock \
 		[list .mbar.commit entryconf [.mbar.commit index last] -state]
 
 	.mbar.commit add command -label [mc "Revert Changes"] \
-		-command do_revert_selection
+		-command do_revert_selection \
+		-accelerator $M1T-J
 	lappend disable_on_lock \
 		[list .mbar.commit entryconf [.mbar.commit index last] -state]
 
@@ -3296,6 +3298,10 @@ unset gws
 bind $ui_comm <$M1B-Key-Return> {do_commit;break}
 bind $ui_comm <$M1B-Key-t> {do_add_selection;break}
 bind $ui_comm <$M1B-Key-T> {do_add_selection;break}
+bind $ui_comm <$M1B-Key-u> {do_unstage_selection;break}
+bind $ui_comm <$M1B-Key-U> {do_unstage_selection;break}
+bind $ui_comm <$M1B-Key-j> {do_revert_selection;break}
+bind $ui_comm <$M1B-Key-J> {do_revert_selection;break}
 bind $ui_comm <$M1B-Key-i> {do_add_all;break}
 bind $ui_comm <$M1B-Key-I> {do_add_all;break}
 bind $ui_comm <$M1B-Key-x> {tk_textCut %W;break}