[shotwell] Fix toolbox not visible in fullscreen

[Jens Georg <jensgeorg src gnome org>]

commit 054ca90f435498d1a58a2f4c91b6ed4857553398
Author: Jens Georg <mail jensge org>
Date:   Thu Mar 2 23:32:48 2017 +0100

    Fix toolbox not visible in fullscreen
    
    Seems to affect Cinnamon so far. Most likely due to the work-around
    for crashing on wayland (1eec412e97c255c9ca235e039dcdc59ee4c3c140)
    
    Signed-off-by: Jens Georg <mail jensge org>

 src/PhotoPage.vala |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/src/PhotoPage.vala b/src/PhotoPage.vala
index 962c80e..5c182a8 100644
--- a/src/PhotoPage.vala
+++ b/src/PhotoPage.vala
@@ -2180,6 +2180,7 @@ public abstract class EditingHostPage : SinglePhotoPage {
             return;
         
         // do this so window size is properly allocated, but window not shown
+        tool_window.set_transient_for(AppWindow.get_instance());
         tool_window.show_all();
         tool_window.hide();