[meld] dirdiff: Disable folder actions while still scanning (bgo#381169)

[Kai Willadsen <kaiw src gnome org>]

commit 6a32b5f36f2d1e9b72e3685644010980aa4d8de1
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sun Jan 11 11:31:20 2015 +1000

    dirdiff: Disable folder actions while still scanning (bgo#381169)
    
    This patch disables the file system modification actions (i.e., Copy
    to Left, Copy to Right, Delete) in folder comparisons while we're
    actually doing the folder scanning. Technically there's nothing
    stopping us from queueing up modifications while we're still scanning,
    but it's additional complication and DirDiff isn't really ready for it.

 meld/dirdiff.py |   14 +++++++++++---
 1 files changed, 11 insertions(+), 3 deletions(-)
---
diff --git a/meld/dirdiff.py b/meld/dirdiff.py
index ceb5c70..d035bc9 100644
--- a/meld/dirdiff.py
+++ b/meld/dirdiff.py
@@ -430,6 +430,8 @@ class DirDiff(melddoc.MeldDoc, gnomeglade.Component):
                 action_name = self.state_actions[s][1]
                 self.actiongroup.get_action(action_name).set_active(True)
 
+        self._scan_in_progress = 0
+
     def on_style_updated(self, widget):
         style = widget.get_style_context()
 
@@ -664,6 +666,7 @@ class DirDiff(melddoc.MeldDoc, gnomeglade.Component):
             self.model.remove(child)
             child = self.model.iter_children( it )
         self._update_item_state(it)
+        self._scan_in_progress += 1
         self.scheduler.add_task(self._search_recursively_iter(path))
 
     def _search_recursively_iter(self, rootpath):
@@ -829,6 +832,7 @@ class DirDiff(melddoc.MeldDoc, gnomeglade.Component):
         yield _("[%s] Done") % self.label_text
 
         self.scheduler.add_task(self.on_treeview_cursor_changed)
+        self._scan_in_progress -= 1
         self.treeview[0].get_selection().select_path(Gtk.TreePath.new_first())
         self._update_diffmaps()
 
@@ -1059,12 +1063,16 @@ class DirDiff(melddoc.MeldDoc, gnomeglade.Component):
                     is_valid = False
                     break
 
+            busy = self._scan_in_progress > 0
+
             get_action("DirCompare").set_sensitive(True)
             get_action("Hide").set_sensitive(True)
-            get_action("DirDelete").set_sensitive(is_valid)
-            get_action("DirCopyLeft").set_sensitive(is_valid and pane > 0)
+            get_action("DirDelete").set_sensitive(
+                is_valid and not busy)
+            get_action("DirCopyLeft").set_sensitive(
+                is_valid and not busy and pane > 0)
             get_action("DirCopyRight").set_sensitive(
-                is_valid and pane + 1 < self.num_panes)
+                is_valid and not busy and pane + 1 < self.num_panes)
             if self.main_actiongroup:
                 act = self.main_actiongroup.get_action("OpenExternal")
                 act.set_sensitive(is_valid)