Create a dummy button in the sidebar.

An invisible button catches the focus instead of the
"All Tasks" row. Thanks to this button, unintended view
resets can be avoided when a focused widget is removed.

This fixes GitHub issue #1017

GTG/gtk/browser/sidebar.py

@@ -74,6 +74,12 @@ def __init__(self, app, ds: Datastore, browser):
         wrap_box.set_vexpand(True)
         wrap_box.set_hexpand(True)
 
+        # Create an invisible dummy button to catch focus in some edge cases
+        self.dummy = Gtk.Button()
+        self.dummy.set_size_request(0, 0)
+        self.dummy.add_css_class('dummy')
+        wrap_box.append(self.dummy)
+
         # -------------------------------------------------------------------------------
         # General Filters
         # -------------------------------------------------------------------------------

GTG/gtk/data/style.css

@@ -10,6 +10,16 @@
     border-top: 1px solid rgb(213, 208, 204);
 }
 
+.dummy {
+  background: transparent;
+  border: none;
+  color: transparent;
+  font-size: 0.001px;
+  margin: -100px;
+  opacity: 0;
+  padding: 0;
+}
+
 /*
     We have to get move the padding into the boxes
     so the background color of the rows reaches all