shell: Add mod+shift left-click as a resize binding
This lets us use compositor-initiated resize on laptops with touchpads and
no middle buttons.
diff --git a/desktop-shell/shell.c b/desktop-shell/shell.c
index 09614b6..2b9241c 100644
--- a/desktop-shell/shell.c
+++ b/desktop-shell/shell.c
@@ -5548,6 +5548,9 @@
weston_compositor_add_touch_binding(ec, mod, touch_move_binding, shell);
weston_compositor_add_button_binding(ec, BTN_MIDDLE, mod,
resize_binding, shell);
+ weston_compositor_add_button_binding(ec, BTN_LEFT,
+ mod | MODIFIER_SHIFT,
+ resize_binding, shell);
if (ec->capabilities & WESTON_CAP_ROTATION_ANY)
weston_compositor_add_button_binding(ec, BTN_RIGHT, mod,