[gnome-screenshot] dialog: set window as modal

[Cosimo Cecchi <cosimoc src gnome org>]

commit b84646e61c80b79b30affbbd5d47e23ceb005624
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Thu Jul 25 11:42:12 2019 +0200

    dialog: set window as modal
    
    This will also make the file chooser come up as a modal dialog
    when the button is clicked.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=595864

 src/screenshot-dialog.ui | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/src/screenshot-dialog.ui b/src/screenshot-dialog.ui
index 4d88296..3d1d5f5 100644
--- a/src/screenshot-dialog.ui
+++ b/src/screenshot-dialog.ui
@@ -7,6 +7,7 @@
     <property name="title" translatable="yes">Save Screenshot</property>
     <property name="resizable">False</property>
     <property name="window_position">center</property>
+    <property name="modal">True</property>
     <child type="titlebar">
       <object class="GtkHeaderBar" id="headerbar1">
         <property name="visible">True</property>