xwayland: treat X11 panel views as if fixedPosition rule is set

include/view.h

@@ -112,6 +112,8 @@ struct view_impl {
 	struct view_size_hints (*get_size_hints)(struct view *self);
 	/* if not implemented, VIEW_WANTS_FOCUS_ALWAYS is assumed */
 	enum view_wants_focus (*wants_focus)(struct view *self);
+	/* returns true if view reserves space at screen edge */
+	bool (*has_strut_partial)(struct view *self);
 };
 
 struct view {
@@ -431,6 +433,14 @@ void view_append_children(struct view *view, struct wl_array *children);
  */
 bool view_is_related(struct view *view, struct wlr_surface *surface);
 
+/**
+ * view_has_strut_partial() - returns true for views that reserve space
+ * at a screen edge (e.g. panels). These views are treated as if they
+ * have the fixedPosition window rule: i.e. they are not restricted to
+ * the usable area and cannot be moved/resized interactively.
+ */
+bool view_has_strut_partial(struct view *view);
+
 const char *view_get_string_prop(struct view *view, const char *prop);
 void view_update_title(struct view *view);
 void view_update_app_id(struct view *view);

src/interactive.c

@@ -35,7 +35,9 @@ interactive_begin(struct view *view, enum input_mode mode, uint32_t edges)
 		return;
 	}
 
-	if (window_rules_get_property(view, "fixedPosition") == LAB_PROP_TRUE) {
+	/* Prevent moving/resizing fixed-position and panel-like views */
+	if (window_rules_get_property(view, "fixedPosition") == LAB_PROP_TRUE
+			|| view_has_strut_partial(view)) {
 		return;
 	}
 

src/view.c

@@ -593,7 +593,9 @@ view_adjust_floating_geometry(struct view *view, struct wlr_box *geometry)
 		return false;
 	}
 
-	if (window_rules_get_property(view, "fixedPosition") == LAB_PROP_TRUE) {
+	/* Avoid moving panels out of their own reserved area ("strut") */
+	if (window_rules_get_property(view, "fixedPosition") == LAB_PROP_TRUE
+			|| view_has_strut_partial(view)) {
 		return false;
 	}
 
@@ -1550,6 +1552,14 @@ view_is_related(struct view *view, struct wlr_surface *surface)
 	return false;
 }
 
+bool
+view_has_strut_partial(struct view *view)
+{
+	assert(view);
+	return view->impl->has_strut_partial &&
+		view->impl->has_strut_partial(view);
+}
+
 const char *
 view_get_string_prop(struct view *view, const char *prop)
 {

src/xwayland.c

@@ -103,6 +103,14 @@ xwayland_view_wants_focus(struct view *view)
 	return VIEW_WANTS_FOCUS_NEVER;
 }
 
+static bool
+xwayland_view_has_strut_partial(struct view *view)
+{
+	struct wlr_xwayland_surface *xsurface =
+		xwayland_surface_from_view(view);
+	return (bool)xsurface->strut_partial;
+}
+
 static struct wlr_xwayland_surface *
 top_parent_of(struct view *view)
 {
@@ -786,6 +794,7 @@ static const struct view_impl xwayland_view_impl = {
 	.is_related = xwayland_view_is_related,
 	.get_size_hints = xwayland_view_get_size_hints,
 	.wants_focus = xwayland_view_wants_focus,
+	.has_strut_partial = xwayland_view_has_strut_partial,
 };
 
 void