git-gui: Teach git gui about file type changes

Signed-off-by: Gustaf Hendeby <hendeby@isy.liu.se>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
diff --git a/lib/commit.tcl b/lib/commit.tcl
index 40a7103..f4ab707 100644
--- a/lib/commit.tcl
+++ b/lib/commit.tcl
@@ -149,6 +149,7 @@
 		_? {continue}
 		A? -
 		D? -
+		T_ -
 		M? {set files_ready 1}
 		U? {
 			error_popup [mc "Unmerged files cannot be committed.
@@ -428,6 +429,7 @@
 		__ -
 		A_ -
 		M_ -
+		T_ -
 		D_ {
 			unset file_states($path)
 			catch {unset selected_paths($path)}