[meld/meld-3-18] meldapp: Always show a window created in `new_window()`

[Kai Willadsen <kaiw src gnome org>]

commit 3aeb083f9f9ba117b892ce855770d87d75b562e1
Author: Kai Willadsen <kai willadsen gmail com>
Date:   Fri Dec 7 08:18:49 2018 +1000

    meldapp: Always show a window created in `new_window()`
    
    If we create multiple windows but one of them never gets activated, then
    it won't ever be seen by the user.
    
    Now we never *should* create multiple windows in one round, but that's a
    different problem.

 meld/meldapp.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
---
diff --git a/meld/meldapp.py b/meld/meldapp.py
index 72b5385b..037ebbe1 100644
--- a/meld/meldapp.py
+++ b/meld/meldapp.py
@@ -150,7 +150,9 @@ class MeldApp(Gtk.Application):
 
         paths = [f.get_path() for f in files]
         try:
-            return window.open_paths(paths, **kwargs)
+            tab = window.open_paths(paths, **kwargs)
+            window.widget.show()
+            return tab
         except ValueError:
             if not new_tab:
                 self.remove_window(window.widget)