workaround for occasional linux window misdraw

main.go

@@ -56,15 +56,15 @@ func main() {
 		} else {
 			mainWindow.Controller.DoConnectToServerWorkflow(defaultServer)
 		}
-		// TODO: There is a race condition with laying out the window before the
-		// window creation animation on Ubuntu (and other DEs?) finishes, where
-		// the window will be misdrawn into a smaller area if the animation hasn't finished.
-		// This makes it much less likely to occur (not seen on dozens of startups)
-		// but is a hacky "solution"!
+
+		// hacky workaround for https://github.com/fyne-io/fyne/issues/4964
 		if runtime.GOOS == "linux" {
-			time.Sleep(350 * time.Millisecond)
-			mainWindow.ForceResize()
+			time.Sleep(100 * time.Millisecond)
+			w, h := mainWindow.DesiredSize()
+			scale := mainWindow.Window.Canvas().Scale()
+			SendResizeToPID(os.Getpid(), int(w*scale), int(h*scale))
 		}
+
 	}()
 
 	mainWindow.Show()

ui/mainwindow.go

@@ -89,7 +89,7 @@ func NewMainWindow(fyneApp fyne.App, appName, displayAppName, appVersion string,
 	m.BottomPanel = NewBottomPanel(app.PlaybackManager, app.ImageManager, m.Controller)
 	m.container = container.NewBorder(nil, m.BottomPanel, nil, nil, m.BrowsingPane)
 	m.Window.SetContent(m.container)
-	m.ForceResize()
+	m.setInitialSize()
 	app.PlaybackManager.OnSongChange(func(item mediaprovider.MediaItem, _ *mediaprovider.Track) {
 		if item == nil {
 			m.Window.SetTitle(displayAppName)
@@ -141,15 +141,20 @@ func NewMainWindow(fyneApp fyne.App, appName, displayAppName, appVersion string,
 	return m
 }
 
-func (m *MainWindow) ForceResize() {
-	w := float32(m.App.Config.Application.WindowWidth)
+func (m *MainWindow) DesiredSize() (w, h float32) {
+	w = float32(m.App.Config.Application.WindowWidth)
 	if w <= 1 {
 		w = 1000
 	}
-	h := float32(m.App.Config.Application.WindowHeight)
+	h = float32(m.App.Config.Application.WindowHeight)
 	if h <= 1 {
 		h = 800
 	}
+	return w, h
+}
+
+func (m *MainWindow) setInitialSize() {
+	w, h := m.DesiredSize()
 	m.Window.Resize(fyne.NewSize(w, h))
 }
 

xresize.c

@@ -0,0 +1,68 @@
+//go:build linux && !wayland
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+#include <unistd.h>
+
+#include "xresize.h"
+
+// thanks ChatGPT ;)
+int find_windows_by_pid(Display *display, Window root, pid_t pid, Window* out, int n) {
+    Window *children;
+    unsigned int nchildren;
+    if (!XQueryTree(display, root, &root, &root, &children, &nchildren)) {
+        return 0;
+    }
+
+    for (unsigned int i = 0; i < nchildren; i++) {
+        Atom pidAtom = XInternAtom(display, "_NET_WM_PID", True);
+        if (pidAtom != None) {
+            Atom type;
+            int format;
+            unsigned long nitems, bytes_after;
+            unsigned char *prop_pid = NULL;
+
+            if (XGetWindowProperty(display, children[i], pidAtom, 0, 1, False, XA_CARDINAL, 
+                                   &type, &format, &nitems, &bytes_after, &prop_pid) == Success && prop_pid) {
+                if (pid == *((pid_t *)prop_pid)) {
+                    out[n++] = children[i];
+                }
+                XFree(prop_pid);
+            }
+        }
+
+        n = find_windows_by_pid(display, children[i], pid, out, n);
+    }
+
+    XFree(children);
+    return n;
+}
+
+void send_resize_event(Display *display, Window window, int width, int height) {
+   XResizeWindow(display, window, width, height);
+   XFlush(display);
+}
+
+int send_resize_to_pid(int pid, int w, int h) {
+    Display *display = XOpenDisplay(NULL);
+    if (!display) {
+        return 1;
+    }
+    int ret = 0;
+    Window windows[128];
+    Window root = DefaultRootWindow(display);
+
+    int n = find_windows_by_pid(display, root, pid, &windows, 0);
+    if (n > 0) {
+	    for (int i = 0; i < n; i++) {
+        	send_resize_event(display, windows[i], w, h);
+	    }
+    } else {
+        ret = 1;
+    }
+
+    XCloseDisplay(display);
+    return ret;
+}

xresize.h

@@ -0,0 +1,3 @@
+//go:build linux && !wayland
+
+int send_resize_to_pid(int pid, int w, int h);

xresize_other.go

@@ -0,0 +1,5 @@
+//go:build !linux || wayland
+
+package main
+
+func SendResizeToPID(pid, w, h int) {}

xresize_x11.go

@@ -0,0 +1,15 @@
+//go:build linux && !wayland
+
+package main
+
+/*
+#cgo LDFLAGS: -lX11
+#include "xresize.h"
+*/
+import (
+	"C"
+)
+
+func SendResizeToPID(pid, w, h int) {
+	C.send_resize_to_pid(C.int(pid), C.int(w), C.int(h))
+}