- Add gnome-shell-error-in-fallback-hotcorner.patch: Fix errors in
fallback HotCorner function. Fixes startup of gnome-shell.

- Update to version 3.7.91:
+ Overview:
- Fade out controls during DND that are not targets
(bgo#686984)
- Keep open when a Control key is held (bgo#686984).
+ Improve login screen => session transition (bgo#694321).
+ Center application grid horizontally (bgo#694261).
+ Fix hiding panel when fullscreen windows span multiple monitors
(bgo#646861)
+ Tweak thresholds of pressure barrier (bgo#694467).
+ Tweak window picker layout (bgo#694902).
+ Expose key grab DBus API to gnome-settings-daemon (bgo#643111).
+ Don't always show message tray in overview, add message
indicator (bgo#687787).
+ Tweak startup animation (bgo#694326).
+ Add OSD popups and expose them to gnome-settings-daemon
(bgo#613543).
+ Move loupe icon to the start of the search entry (bgo#695069).
+ Don't show the input switcher with less than 2 items
(bgo#695000).
+ Fix auto-completion of system modals immediately upon display
(bgo#692937).
+ Ignore workspaces in alt-tab (bgo#661156).
+ Disable copying text from password entries (bgo#695104).
+ Use standard styling for ibus candidate popups (bgo#694796).
+ Fix calendar changing height on month changes (bgo#641383).
+ Port the hot corner to use pressure barriers (bgo#663661).