[meld/deprecation-cleanup] Rename state-changed signal to avoid name clash and move to Signal

[Kai Willadsen <kaiw src gnome org>]

commit 708bae3bf7eedb22ab74d97999a99603a487648b
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Sun Dec 9 06:46:41 2018 +1000

    Rename state-changed signal to avoid name clash and move to Signal

 meld/melddoc.py    | 7 +++++--
 meld/meldwindow.py | 2 +-
 2 files changed, 6 insertions(+), 3 deletions(-)
---
diff --git a/meld/melddoc.py b/meld/melddoc.py
index cbe21754..723d8ec9 100644
--- a/meld/melddoc.py
+++ b/meld/melddoc.py
@@ -82,13 +82,16 @@ class MeldDoc(LabeledObjectMixin, GObject.GObject):
                                  ()),
         'next-diff-changed':    (GObject.SignalFlags.RUN_FIRST, None,
                                  (bool, bool)),
-        'state-changed': (GObject.SignalFlags.RUN_FIRST, None, (int, int)),
     }
 
     @GObject.Signal(name='close')
     def close_signal(self, exit_code: int) -> None:
         ...
 
+    @GObject.Signal
+    def tab_state_changed(self, old_state: int, new_state: int) -> None:
+        ...
+
     def __init__(self):
         super().__init__()
         self.scheduler = FifoScheduler()
@@ -104,7 +107,7 @@ class MeldDoc(LabeledObjectMixin, GObject.GObject):
     def state(self, value):
         if value == self._state:
             return
-        self.emit('state-changed', self._state, value)
+        self.tab_state_changed.emit(self._state, value)
         self._state = value
 
     def get_comparison(self) -> RecentType:
diff --git a/meld/meldwindow.py b/meld/meldwindow.py
index 24c43c97..bcc91c89 100644
--- a/meld/meldwindow.py
+++ b/meld/meldwindow.py
@@ -530,7 +530,7 @@ class MeldWindow(Gtk.ApplicationWindow):
             page.connect("file-changed", self.on_file_changed)
             page.connect("create-diff", lambda obj, arg, kwargs:
                          self.append_diff(arg, **kwargs))
-            page.connect("state-changed", self.on_page_state_changed)
+            page.tab_state_changed.connect(self.on_page_state_changed)
         page.close_signal.connect(self.page_removed)
 
         self.notebook.set_tab_reorderable(tab_widget(page), True)