fix on desktop switch

src/common.h

@@ -292,7 +292,6 @@ typedef struct session {
 	/// Index of the next free slot in <code>expose_rects</code>.
 	int n_expose;
 	/// Current desktop of display
-	uint32_t prev_desktop;
 	uint32_t cur_desktop;
 
 	// === Window related ===

src/event.c

@@ -458,10 +458,19 @@ static inline void ev_property_notify(session_t *ps, xcb_property_notify_event_t
 							1L, XCB_ATOM_CARDINAL, 32);
 
 			if (prop.nitems) {
-				ps->prev_desktop = ps->cur_desktop;
-				ps->cur_desktop = *prop.c32;
-				if (!ps->prev_desktop)
-					ps->prev_desktop = ps->cur_desktop;
+				if (ps->cur_desktop != *prop.c32) {
+					win_stack_foreach_managed_safe(w, &ps->window_stack) {
+						if (w->a.override_redirect) {
+							continue;
+						}
+						if (w->cur_desktop & *prop.c32) {
+							w->dwm_mask = ANIM_NEXT_TAG;
+						} else if (w->cur_desktop & ps->cur_desktop) {
+							w->dwm_mask = ANIM_PREV_TAG;
+						}
+					}
+					ps->cur_desktop = *prop.c32;
+				}
 			}
 		}
 

src/picom.c

@@ -1723,7 +1723,6 @@ static void draw_callback_impl(EV_P_ session_t *ps, int revents attr_unused) {
 		ps->fade_time = 0L;
 	}
 	if (!animation_running) {
-		ps->prev_desktop = ps->cur_desktop;
 		ps->animation_time = 0L;
 	}
 
@@ -1884,7 +1883,6 @@ static session_t *session_init(int argc, char **argv, Display *dpy,
 	    .shadow_context = NULL,
 
 	    .cur_desktop = 0,
-	    .prev_desktop = 0,
 
 #ifdef CONFIG_VSYNC_DRM
 	    .drm_fd = -1,

src/win.c

@@ -694,14 +694,6 @@ void win_process_update_flags(session_t *ps, struct managed_win *w) {
 			// 	w->dwm_mask = ANIM_PREV_TAG;
 			// else if (w->pending_g.y > 0 && w->g.y < 0 && abs(w->pending_g.y - w->g.y) >= w->pending_g.height)
 			// 	w->dwm_mask = ANIM_NEXT_TAG;
-			if (!w->a.override_redirect && ps->cur_desktop != ps->prev_desktop) {
-				if (w->cur_desktop == ps->cur_desktop) {
-					w->dwm_mask = ANIM_NEXT_TAG;
-				} else {
-					w->dwm_mask = ANIM_PREV_TAG;
-				}
-			}
-
 
 			if (!was_visible || w->dwm_mask) {
 

src/win.h

@@ -171,8 +171,8 @@ struct managed_win {
 	/// opacity state, window geometry, window mapped/unmapped state,
 	/// window mode of the windows above. DOES NOT INCLUDE the body of THIS WINDOW.
 	/// NULL means reg_ignore has not been calculated for this window.
-    /// 1 = tag prev  , 2 = tag next, 4 = unmap
-    uint32_t dwm_mask;
+	/// 1 = tag prev  , 2 = tag next, 4 = unmap
+	uint32_t dwm_mask;
 	rc_region_t *reg_ignore;
 	/// Whether the reg_ignore of all windows beneath this window are valid
 	bool reg_ignore_valid;
@@ -203,11 +203,11 @@ struct managed_win {
 	/// Inverse of the window distance at the start of animation, for
 	/// tracking animation progress
 	double animation_inv_og_distance;
-    /// Animation info if it is a tag change & check if its changing window sizes
-    /// 0: no tag change
-    /// 1: normal tag change animation
-    /// 2: tag change animation that effects window size
-    uint16_t animation_is_tag;
+	/// Animation info if it is a tag change & check if its changing window sizes
+    	/// 0: no tag change
+    	/// 1: normal tag change animation
+    	/// 2: tag change animation that effects window size
+    	uint16_t animation_is_tag;
 
 	// Client window related members
 	/// ID of the top-level client window of the window.