Do not update status bar for 'widgets'

Sublime widgets are e.g. the command palette, and the input box at the bottom.
For these views we generally do not need to update the status bar.

Views without a window are also now called transient. These are detached views
after close.

core/commands/status_bar.py

@@ -27,19 +27,29 @@ def on_post_save(self, view):
 update_status_bar_soon = False
 
 
+def view_is_transient(view):
+    window = view.window()
+    if not window:
+        return True
+
+    group, index = window.get_view_index(view)
+    if index == -1:  # input panels, aka 'widgets'
+        return True
+
+    if window.transient_view_in_group(window.active_group()) == view:
+        return True
+
+    return False
+
+
 class GsUpdateStatusBarCommand(TextCommand, GitCommand):
 
     """
     Update the short Git status in the Sublime status bar.
     """
 
     def run(self, edit):
-
-        window = self.view.window()
-        if not window or \
-            (self.view.file_name() and
-                self.view == window.transient_view_in_group(window.active_group())):
-            # it means it is an transient view of a regular file
+        if view_is_transient(self.view):
             return
 
         global last_execution, update_status_bar_soon