Ignore fold change events for other display ids

Scrcpy mirrors a specific display id, it must ignore events for other
display ids.

Fixes #4120 <https://github.com/Genymobile/scrcpy/issues/4120>

app/src/screen.c

@@ -488,7 +488,6 @@ sc_screen_show_initial_window(struct sc_screen *screen) {
     }
 
     SDL_ShowWindow(screen->window);
-    sc_screen_update_content_rect(screen);
 }
 
 void
@@ -849,8 +848,6 @@ sc_screen_convert_drawable_to_frame_coords(struct sc_screen *screen,
     int32_t w = screen->content_size.width;
     int32_t h = screen->content_size.height;
 
-    // screen->rect must be initialized to avoid a division by zero
-    assert(screen->rect.w && screen->rect.h);
 
     x = (int64_t) (x - screen->rect.x) * w / screen->rect.w;
     y = (int64_t) (y - screen->rect.y) * h / screen->rect.h;

server/src/main/java/com/genymobile/scrcpy/Device.java

@@ -103,6 +103,11 @@ public final class Device {
             ServiceManager.getWindowManager().registerDisplayFoldListener(new IDisplayFoldListener.Stub() {
                 @Override
                 public void onDisplayFoldChanged(int displayId, boolean folded) {
+                    if (Device.this.displayId != displayId) {
+                        // Ignore events related to other display ids
+                        return;
+                    }
+
                     synchronized (Device.this) {
                         DisplayInfo displayInfo = ServiceManager.getDisplayManager().getDisplayInfo(displayId);
                         if (displayInfo == null) {