[fractal] room_history: re-enable kinetic scrolling after loading more

[Julian Sparber <jsparber src gnome org>]

commit 908a837b780db3344aa6355e15b933e1113d6f07
Author: Christopher Davis <brainblasted disroot org>
Date:   Sun Mar 10 00:53:16 2019 -0500

    room_history: re-enable kinetic scrolling after loading more
    
    Previously kinetic scrolling was disabled while loading more
    messages and was never re-enabled. This could lead to rooms
    not scrolling with touch gestures.
    
    Now after we add widgets to the top, we re-enable kinetic
    scrolling for our ScrolledWindow.
    
    Fixes https://gitlab.gnome.org/GNOME/fractal/issues/458

 fractal-gtk/src/widgets/room_history.rs  | 1 +
 fractal-gtk/src/widgets/scroll_widget.rs | 5 +++++
 2 files changed, 6 insertions(+)
---
diff --git a/fractal-gtk/src/widgets/room_history.rs b/fractal-gtk/src/widgets/room_history.rs
index 9ab8a6c9..6e4223a4 100644
--- a/fractal-gtk/src/widgets/room_history.rs
+++ b/fractal-gtk/src/widgets/room_history.rs
@@ -52,6 +52,7 @@ impl List {
             }
         }
         self.list.push_back(element);
+        self.view.set_kinetic_scrolling(true);
         /* TODO: update the previous message:
          * we need to update the previous row because it could be that we have to remove the header */
         None
diff --git a/fractal-gtk/src/widgets/scroll_widget.rs b/fractal-gtk/src/widgets/scroll_widget.rs
index 8fd53639..870db9f1 100644
--- a/fractal-gtk/src/widgets/scroll_widget.rs
+++ b/fractal-gtk/src/widgets/scroll_widget.rs
@@ -255,6 +255,11 @@ impl ScrollWidget {
         self.widgets.view.set_kinetic_scrolling(false);
         self.balance.set(Some(Position::Top));
     }
+
+    pub fn set_kinetic_scrolling(&self, enabled: bool) {
+        self.widgets.view.set_kinetic_scrolling(enabled);
+    }
+
     pub fn get_listbox(&self) -> gtk::ListBox {
         self.widgets.listbox.clone()
     }