Multiple changes to DisplayServerX11

- Travis: Change x11 to linuxbsd
- SCons: Change x11 plataform to linuxbsd
- Plugins: Remove ; to avoid fallthrough warning
- DisplayServerX11: Implement set_icon
- DisplayServerX11: Fix X11 bug when a window was erased from windows
  map, all the changes from that erased windows are sending to the main
  window
- DisplayServerX11: Reorder create_window commands
- DisplayServerX11: Change every Size2 to Size2i and Rect2 to Rect2i
  where it belongs

+ More X11 fixes which have been integrated directly back into reduz's
original commits while rebasing the branch.

14 files changed, 157 insertions, 65 deletions

diff --git a/.travis.yml b/.travis.yml
index eeeedef063..f6c40382dd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -31,7 +31,7 @@ matrix:
 
     - name: Linux editor (debug, GCC 9, with Mono)
       stage: build
-      env: PLATFORM=x11 TOOLS=yes TARGET=debug CACHE_NAME=${PLATFORM}-tools-mono-gcc-9 MATRIX_EVAL="CC=gcc-9 && CXX=g++-9" EXTRA_ARGS="module_mono_enabled=yes mono_glue=no warnings=extra werror=yes"
+      env: PLATFORM=linuxbsd TOOLS=yes TARGET=debug CACHE_NAME=${PLATFORM}-tools-mono-gcc-9 MATRIX_EVAL="CC=gcc-9 && CXX=g++-9" EXTRA_ARGS="module_mono_enabled=yes mono_glue=no warnings=extra werror=yes"
       os: linux
       compiler: gcc-9
       addons:
@@ -47,7 +47,7 @@ matrix:
 
     - name: Linux export template (release, Clang 7)
       stage: build
-      env: PLATFORM=x11 TOOLS=no TARGET=release CACHE_NAME=${PLATFORM}-clang EXTRA_ARGS="warnings=extra werror=yes"
+      env: PLATFORM=linuxbsd TOOLS=no TARGET=release CACHE_NAME=${PLATFORM}-clang EXTRA_ARGS="warnings=extra werror=yes"
       os: linux
       compiler: clang
       addons:
@@ -109,7 +109,7 @@ matrix:
 
     - name: Linux export template (release_debug, GCC 7, without 3D support)
       stage: build
-      env: PLATFORM=x11 TOOLS=no TARGET=release_debug CACHE_NAME=${PLATFORM}-gcc-7 EXTRA_ARGS="disable_3d=yes"
+      env: PLATFORM=linuxbsd TOOLS=no TARGET=release_debug CACHE_NAME=${PLATFORM}-gcc-7 EXTRA_ARGS="disable_3d=yes"
       os: linux
       compiler: gcc
       addons:
@@ -165,7 +165,7 @@ script:
       scons -j2 CC=$CC CXX=$CXX platform=$PLATFORM tools=$TOOLS target=$TARGET $OPTIONS $EXTRA_ARGS &&
       if [ "$TEST_PROJECT" = "yes" ]; then
         git clone --depth 1 "https://github.com/godotengine/godot-tests.git";
-        sed -i "s:custom_template/release=\"\":custom_template/release=\"$(readlink -e bin/godot_server.x11.opt.tools.64)\":" godot-tests/tests/project_export/export_presets.cfg;
-        godot-tests/tests/project_export/test_project.sh "bin/godot_server.x11.opt.tools.64";
+        sed -i "s:custom_template/release=\"\":custom_template/release=\"$(readlink -e bin/godot_server.linuxbsd.opt.tools.64)\":" godot-tests/tests/project_export/export_presets.cfg;
+        godot-tests/tests/project_export/test_project.sh "bin/godot_server.linuxbsd.opt.tools.64";
       fi
     fi
diff --git a/editor/plugins/script_editor_plugin.cpp b/editor/plugins/script_editor_plugin.cpp
index 67b3745e0d..0e867f7b16 100644
--- a/editor/plugins/script_editor_plugin.cpp
+++ b/editor/plugins/script_editor_plugin.cpp
@@ -215,7 +215,7 @@ void ScriptEditorQuickOpen::_notification(int p_what) {
 
 			search_box->set_clear_button_enabled(true);
 			[[fallthrough]];
-		};
+		}
 		case NOTIFICATION_VISIBILITY_CHANGED: {
 			search_box->set_right_icon(search_options->get_theme_icon("Search", "EditorIcons"));
 		} break;
diff --git a/editor/project_manager.cpp b/editor/project_manager.cpp
index 168decd788..b4e4ed73f2 100644
--- a/editor/project_manager.cpp
+++ b/editor/project_manager.cpp
@@ -143,7 +143,7 @@ private:
 			install_status_rect->set_texture(new_icon);
 		}
 
-		set_size(Size2(500, 0) * EDSCALE);
+		set_size(Size2i(500, 0) * EDSCALE);
 	}
 
 	String _test_path() {
@@ -788,7 +788,7 @@ public:
 			_test_path();
 		}
 
-		popup_centered(Size2(500, 0) * EDSCALE);
+		popup_centered(Size2i(500, 0) * EDSCALE);
 	}
 
 	ProjectDialog() {
diff --git a/main/main.cpp b/main/main.cpp
index 2ce3001829..c9fde81f7a 100644
--- a/main/main.cpp
+++ b/main/main.cpp
@@ -905,7 +905,7 @@ Error Main::setup(const char *execpath, int argc, char *argv[], bool p_second_ph
 #else
 		const String error_msg = "Error: Couldn't load project data at path \"" + project_path + "\". Is the .pck file missing?\nIf you've renamed the executable, the associated .pck file should also be renamed to match the executable's name (without the extension).\n";
 		OS::get_singleton()->print("%s", error_msg.ascii().get_data());
-		OS::get_singleton()->alert(error_msg);
+		DisplayServer::get_singleton()->alert(error_msg);
 
 		goto error;
 #endif
diff --git a/modules/assimp/SCsub b/modules/assimp/SCsub
index 90cdd7f5fc..cef2396dfb 100644
--- a/modules/assimp/SCsub
+++ b/modules/assimp/SCsub
@@ -75,7 +75,7 @@ if True:  # env['builtin_assimp']:
     if(env['platform'] == 'windows'):
         env_assimp.Append(CPPDEFINES=['PLATFORM_WINDOWS'])
         env_assimp.Append(CPPDEFINES=[('PLATFORM', 'WINDOWS')])
-    elif(env['platform'] == 'x11'):
+    elif(env['platform'] == 'linuxbsd'):
         env_assimp.Append(CPPDEFINES=['PLATFORM_LINUX'])
         env_assimp.Append(CPPDEFINES=[('PLATFORM', 'LINUX')])
     elif(env['platform'] == 'osx'):
diff --git a/modules/mono/build_scripts/mono_configure.py b/modules/mono/build_scripts/mono_configure.py
index 9a6198f13a..4e101583ef 100644
--- a/modules/mono/build_scripts/mono_configure.py
+++ b/modules/mono/build_scripts/mono_configure.py
@@ -45,11 +45,11 @@ def copy_file(src_dir, dst_dir, name):
 
 
 def is_desktop(platform):
-    return platform in ['windows', 'osx', 'x11', 'server', 'uwp', 'haiku']
+    return platform in ['windows', 'osx', 'linuxbsd', 'server', 'uwp', 'haiku']
 
 
 def is_unix_like(platform):
-    return platform in ['osx', 'x11', 'server', 'android', 'haiku']
+    return platform in ['osx', 'linuxbsd', 'server', 'android', 'haiku']
 
 
 def module_supports_tools_on(platform):
diff --git a/modules/mono/config.py b/modules/mono/config.py
index a5d3059ecc..3ee1618366 100644
--- a/modules/mono/config.py
+++ b/modules/mono/config.py
@@ -3,7 +3,7 @@ def can_build(env, platform):
 
 
 def configure(env):
-    if env['platform'] not in ['windows', 'osx', 'x11', 'server', 'android', 'haiku', 'javascript']:
+    if env['platform'] not in ['windows', 'osx', 'linuxbsd', 'server', 'android', 'haiku', 'javascript']:
         raise RuntimeError('This module does not currently support building for this platform')
 
     env.use_ptrcall = True
diff --git a/modules/mono/editor/GodotTools/GodotTools/Utils/OS.cs b/modules/mono/editor/GodotTools/GodotTools/Utils/OS.cs
index 279e67b3eb..11a4109d97 100644
--- a/modules/mono/editor/GodotTools/GodotTools/Utils/OS.cs
+++ b/modules/mono/editor/GodotTools/GodotTools/Utils/OS.cs
@@ -33,7 +33,7 @@ namespace GodotTools.Utils
         {
             public const string Windows = "windows";
             public const string OSX = "osx";
-            public const string X11 = "x11";
+            public const string X11 = "linuxbsd";
             public const string Server = "server";
             public const string UWP = "uwp";
             public const string Haiku = "haiku";
diff --git a/modules/webm/libvpx/SCsub b/modules/webm/libvpx/SCsub
index 14fa6c1268..6aed8a16f5 100644
--- a/modules/webm/libvpx/SCsub
+++ b/modules/webm/libvpx/SCsub
@@ -270,12 +270,12 @@ if env["platform"] == 'uwp':
         webm_cpu_x86 = True
 else:
     import platform
-    is_x11_or_server_arm = ((env["platform"] == 'x11' or env["platform"] == 'server') and (platform.machine().startswith('arm') or platform.machine().startswith('aarch')))
+    is_x11_or_server_arm = ((env["platform"] == 'linuxbsd' or env["platform"] == 'server') and (platform.machine().startswith('arm') or platform.machine().startswith('aarch')))
     is_ios_x86 = (env["platform"] == 'iphone' and ("arch" in env and env["arch"].startswith('x86')))
     is_android_x86 = (env["platform"] == 'android' and env["android_arch"].startswith('x86'))
     if is_android_x86:
         cpu_bits = '32' if env["android_arch"] == 'x86' else '64'
-    webm_cpu_x86 = not is_x11_or_server_arm and (cpu_bits == '32' or cpu_bits == '64') and (env["platform"] == 'windows' or env["platform"] == 'x11' or env["platform"] == 'osx' or env["platform"] == 'haiku' or is_android_x86 or is_ios_x86)
+    webm_cpu_x86 = not is_x11_or_server_arm and (cpu_bits == '32' or cpu_bits == '64') and (env["platform"] == 'windows' or env["platform"] == 'linuxbsd' or env["platform"] == 'osx' or env["platform"] == 'haiku' or is_android_x86 or is_ios_x86)
     webm_cpu_arm = is_x11_or_server_arm or (not is_ios_x86 and env["platform"] == 'iphone') or (not is_android_x86 and env["platform"] == 'android')
 
 if webm_cpu_x86:
@@ -330,7 +330,7 @@ if webm_cpu_x86:
 if webm_cpu_arm:
     if env["platform"] == 'iphone':
         env_libvpx["ASFLAGS"] = '-arch armv7'
-    elif env["platform"] == 'android' and env["android_arch"] == 'armv7' or env["platform"] == 'x11' or env["platform"] == 'server':
+    elif env["platform"] == 'android' and env["android_arch"] == 'armv7' or env["platform"] == 'linuxbsd' or env["platform"] == 'server':
         env_libvpx["ASFLAGS"] = '-mfpu=neon'
     elif env["platform"] == 'uwp':
         env_libvpx["AS"] = 'armasm'
diff --git a/platform/linuxbsd/display_server_x11.cpp b/platform/linuxbsd/display_server_x11.cpp
index ffe6af41e2..d847270e64 100644
--- a/platform/linuxbsd/display_server_x11.cpp
+++ b/platform/linuxbsd/display_server_x11.cpp
@@ -1079,7 +1079,7 @@ Size2i DisplayServerX11::window_get_real_size(WindowID p_window) const {
 			XFree(data);
 		}
 	}
-	return Size2(w, h);
+	return Size2i(w, h);
 }
 
 bool DisplayServerX11::window_is_maximize_allowed(WindowID p_window) const {
@@ -1214,7 +1214,7 @@ void DisplayServerX11::_set_wm_fullscreen(WindowID p_window, bool p_enabled) {
 
 	if (!p_enabled) {
 		// Reset the non-resizable flags if we un-set these before.
-		Size2 size = window_get_size(p_window);
+		Size2i size = window_get_size(p_window);
 		XSizeHints *xsh;
 		xsh = XAllocSizeHints();
 		if (window_get_flag(WINDOW_FLAG_RESIZE_DISABLED, p_window)) {
@@ -1225,12 +1225,12 @@ void DisplayServerX11::_set_wm_fullscreen(WindowID p_window, bool p_enabled) {
 			xsh->max_height = size.y;
 		} else {
 			xsh->flags = 0L;
-			if (wd.min_size != Size2()) {
+			if (wd.min_size != Size2i()) {
 				xsh->flags |= PMinSize;
 				xsh->min_width = wd.min_size.x;
 				xsh->min_height = wd.min_size.y;
 			}
-			if (wd.max_size != Size2()) {
+			if (wd.max_size != Size2i()) {
 				xsh->flags |= PMaxSize;
 				xsh->max_width = wd.max_size.x;
 				xsh->max_height = wd.max_size.y;
@@ -1471,7 +1471,7 @@ void DisplayServerX11::window_set_flag(WindowFlags p_flag, bool p_enabled, Windo
 			XSizeHints *xsh;
 			xsh = XAllocSizeHints();
 			if (p_enabled) {
-				Size2 size = window_get_size(p_window);
+				Size2i size = window_get_size(p_window);
 
 				xsh->flags = PMinSize | PMaxSize;
 				xsh->min_width = size.x;
@@ -1480,12 +1480,12 @@ void DisplayServerX11::window_set_flag(WindowFlags p_flag, bool p_enabled, Windo
 				xsh->max_height = size.y;
 			} else {
 				xsh->flags = 0L;
-				if (wd.min_size != Size2()) {
+				if (wd.min_size != Size2i()) {
 					xsh->flags |= PMinSize;
 					xsh->min_width = wd.min_size.x;
 					xsh->min_height = wd.min_size.y;
 				}
-				if (wd.max_size != Size2()) {
+				if (wd.max_size != Size2i()) {
 					xsh->flags |= PMaxSize;
 					xsh->max_width = wd.max_size.x;
 					xsh->max_height = wd.max_size.y;
@@ -1749,8 +1749,8 @@ void DisplayServerX11::cursor_set_custom_image(const RES &p_cursor, CursorShape
 		Ref<Texture2D> texture = p_cursor;
 		Ref<AtlasTexture> atlas_texture = p_cursor;
 		Ref<Image> image;
-		Size2 texture_size;
-		Rect2 atlas_rect;
+		Size2i texture_size;
+		Rect2i atlas_rect;
 
 		if (texture.is_valid()) {
 			image = texture->get_data();
@@ -2221,7 +2221,7 @@ void DisplayServerX11::_window_changed(XEvent *event) {
 
 	WindowID window_id = MAIN_WINDOW_ID;
 
-	//assign the event to the relevant window
+	// Assign the event to the relevant window
 	for (Map<WindowID, WindowData>::Element *E = windows.front(); E; E = E->next()) {
 		if (event->xany.window == E->get().x11_window) {
 			window_id = E->key();
@@ -2230,6 +2230,9 @@ void DisplayServerX11::_window_changed(XEvent *event) {
 	}
 
 	WindowData &wd = windows[window_id];
+	if (wd.x11_window != event->xany.window) { // Check if the correct window
+		return;
+	}
 
 	if (wd.xic) {
 		//  Not portable.
@@ -2314,7 +2317,7 @@ void DisplayServerX11::process_events() {
 
 		WindowID window_id = MAIN_WINDOW_ID;
 
-		//assign the event to the relevant window
+		// Assign the event to the relevant window
 		for (Map<WindowID, WindowData>::Element *E = windows.front(); E; E = E->next()) {
 			if (event.xany.window == E->get().x11_window) {
 				window_id = E->key();
@@ -2995,8 +2998,87 @@ void DisplayServerX11::set_context(Context p_context) {
 void DisplayServerX11::set_native_icon(const String &p_filename) {
 	WARN_PRINT("Native icon not supported by this display server.");
 }
+
+bool g_set_icon_error = false;
+int set_icon_errorhandler(Display *dpy, XErrorEvent *ev) {
+	g_set_icon_error = true;
+	return 0;
+}
+
 void DisplayServerX11::set_icon(const Ref<Image> &p_icon) {
-	WARN_PRINT("Icon not supported by this display server.");
+	_THREAD_SAFE_METHOD_
+
+	WindowData &wd = windows[MAIN_WINDOW_ID];
+
+	int (*oldHandler)(Display *, XErrorEvent *) = XSetErrorHandler(&set_icon_errorhandler);
+
+	Atom net_wm_icon = XInternAtom(x11_display, "_NET_WM_ICON", False);
+
+	if (p_icon.is_valid()) {
+		Ref<Image> img = p_icon->duplicate();
+		img->convert(Image::FORMAT_RGBA8);
+
+		while (true) {
+			int w = img->get_width();
+			int h = img->get_height();
+
+			if (g_set_icon_error) {
+				g_set_icon_error = false;
+
+				WARN_PRINT("Icon too large, attempting to resize icon.");
+
+				int new_width, new_height;
+				if (w > h) {
+					new_width = w / 2;
+					new_height = h * new_width / w;
+				} else {
+					new_height = h / 2;
+					new_width = w * new_height / h;
+				}
+
+				w = new_width;
+				h = new_height;
+
+				if (!w || !h) {
+					WARN_PRINT("Unable to set icon.");
+					break;
+				}
+
+				img->resize(w, h, Image::INTERPOLATE_CUBIC);
+			}
+
+			// We're using long to have wordsize (32Bit build -> 32 Bits, 64 Bit build -> 64 Bits
+			Vector<long> pd;
+
+			pd.resize(2 + w * h);
+
+			pd.write[0] = w;
+			pd.write[1] = h;
+
+			const uint8_t *r = img->get_data().ptr();
+
+			long *wr = &pd.write[2];
+			uint8_t const *pr = r;
+
+			for (int i = 0; i < w * h; i++) {
+				long v = 0;
+				//    A             R             G            B
+				v |= pr[3] << 24 | pr[0] << 16 | pr[1] << 8 | pr[2];
+				*wr++ = v;
+				pr += 4;
+			}
+
+			XChangeProperty(x11_display, wd.x11_window, net_wm_icon, XA_CARDINAL, 32, PropModeReplace, (unsigned char *)pd.ptr(), pd.size());
+
+			if (!g_set_icon_error)
+				break;
+		}
+	} else {
+		XDeleteProperty(x11_display, wd.x11_window, net_wm_icon);
+	}
+
+	XFlush(x11_display);
+	XSetErrorHandler(oldHandler);
 }
 
 Vector<String> DisplayServerX11::get_rendering_drivers_func() {
@@ -3042,38 +3124,9 @@ DisplayServerX11::WindowID DisplayServerX11::_create_window(WindowMode p_mode, u
 		WindowData wd;
 		wd.x11_window = XCreateWindow(x11_display, RootWindow(x11_display, visualInfo->screen), p_rect.position.x, p_rect.position.y, p_rect.size.width, p_rect.size.height, 0, visualInfo->depth, InputOutput, visualInfo->visual, valuemask, &windowAttributes);
 
-		if (windows.size() > 0) {
-			//this is a sub window, don't let the window manager put it wherever it wants
-
-			XSizeHints my_hints = { 0 };
-
-			my_hints.flags = PPosition | PSize; /* I want to specify position and size */
-			my_hints.x = p_rect.position.x; /* The origin and size coords I want */
-			my_hints.y = p_rect.position.y;
-			my_hints.width = p_rect.size.width;
-			my_hints.height = p_rect.size.height;
-
-			XSetNormalHints(x11_display, wd.x11_window, &my_hints);
-			//its still not working :(
-		}
-		//set_class_hint(x11_display, wd.x11_window);
 		XMapWindow(x11_display, wd.x11_window);
-		XFlush(x11_display);
-
-		XSync(x11_display, False);
-		//XSetErrorHandler(oldHandler);
-
-		XFree(visualInfo);
-
-#if defined(VULKAN_ENABLED)
-		if (context_vulkan) {
-			Error err = context_vulkan->window_create(window_id_counter, wd.x11_window, x11_display, p_rect.size.width, p_rect.size.height);
-			ERR_FAIL_COND_V_MSG(err != OK, INVALID_WINDOW_ID, "Can't create a Vulkan window");
-		}
-#endif
 
 		//associate PID
-
 		// make PID known to X11
 		{
 			const long pid = OS::get_singleton()->get_process_id();
@@ -3152,6 +3205,41 @@ DisplayServerX11::WindowID DisplayServerX11::_create_window(WindowMode p_mode, u
 		id = window_id_counter++;
 
 		windows[id] = wd;
+
+		if (id != MAIN_WINDOW_ID) {
+			//this is a sub window, don't let the window manager put it wherever it wants
+			for (int i = 0; i < WINDOW_FLAG_MAX; i++) {
+				if (p_flags & (1 << i)) {
+					window_set_flag(WindowFlags(i), true, id);
+				}
+			}
+
+			XSizeHints my_hints = XSizeHints();
+
+			my_hints.flags = PPosition | PSize; /* I want to specify position and size */
+			my_hints.x = p_rect.position.x; /* The origin and size coords I want */
+			my_hints.y = p_rect.position.y;
+			my_hints.width = p_rect.size.width;
+			my_hints.height = p_rect.size.height;
+
+			XSetNormalHints(x11_display, wd.x11_window, &my_hints);
+			XMoveWindow(x11_display, wd.x11_window, p_rect.position.x, p_rect.position.y);
+		}
+
+#if defined(VULKAN_ENABLED)
+		if (context_vulkan) {
+			Error err = context_vulkan->window_create(id, wd.x11_window, x11_display, p_rect.size.width, p_rect.size.height);
+			ERR_FAIL_COND_V_MSG(err != OK, INVALID_WINDOW_ID, "Can't create a Vulkan window");
+		}
+#endif
+
+		//set_class_hint(x11_display, wd.x11_window);
+		XFlush(x11_display);
+
+		XSync(x11_display, False);
+		//XSetErrorHandler(oldHandler);
+
+		XFree(visualInfo);
 	}
 
 	WindowData &wd = windows[id];
@@ -3168,7 +3256,7 @@ DisplayServerX11::WindowID DisplayServerX11::_create_window(WindowMode p_mode, u
 		wd.size.width = xwa.width;
 		wd.size.height = xwa.height;
 
-		//print_line("created at rect: " + p_rect + " but at rect " + Rect2i(xwa.x, xwa.y, xwa.width, xwa.height));
+		print_line("created at rect: " + p_rect + " but at rect " + Rect2i(xwa.x, xwa.y, xwa.width, xwa.height));
 	}
 
 	//set cursor
diff --git a/platform/linuxbsd/display_server_x11.h b/platform/linuxbsd/display_server_x11.h
index 5747ac93ba..10067671e7 100644
--- a/platform/linuxbsd/display_server_x11.h
+++ b/platform/linuxbsd/display_server_x11.h
@@ -119,7 +119,7 @@ class DisplayServerX11 : public DisplayServer {
 		Size2i min_size;
 		Size2i max_size;
 		Size2i size;
-		Size2i im_position;
+		Point2i im_position;
 		bool im_active = false;
 		Callable rect_changed_callback;
 		Callable event_callback;
diff --git a/platform/server/detect.py b/platform/server/detect.py
index db9ba8d036..4ea4bddddd 100644
--- a/platform/server/detect.py
+++ b/platform/server/detect.py
@@ -16,7 +16,7 @@ def get_name():
 def get_program_suffix():
     if (sys.platform == "darwin"):
         return "osx"
-    return "x11"
+    return "linuxbsd"
 
 
 def can_build():
diff --git a/scene/gui/text_edit.cpp b/scene/gui/text_edit.cpp
index 5bc920b04e..49e89f6c6d 100644
--- a/scene/gui/text_edit.cpp
+++ b/scene/gui/text_edit.cpp
@@ -5062,7 +5062,7 @@ void TextEdit::_update_caches() {
 #ifdef TOOLS_ENABLED
 	cache.line_spacing = get_theme_constant("line_spacing") * EDSCALE;
 #else
-	cache.line_spacing = get_constant("line_spacing");
+	cache.line_spacing = get_theme_constant("line_spacing");
 #endif
 	cache.row_height = cache.font->get_height() + cache.line_spacing;
 	cache.tab_icon = get_theme_icon("tab");
diff --git a/scene/main/window.cpp b/scene/main/window.cpp
index f8a86b0957..6c2e2f1d31 100644
--- a/scene/main/window.cpp
+++ b/scene/main/window.cpp
@@ -99,7 +99,9 @@ Size2i Window::get_real_size() const {
 
 void Window::set_max_size(const Size2i &p_max_size) {
 	max_size = p_max_size;
-	DisplayServer::get_singleton()->window_set_min_size(max_size, window_id);
+	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
+		DisplayServer::get_singleton()->window_set_max_size(max_size, window_id);
+	}
 	_update_window_size();
 }
 Size2i Window::get_max_size() const {
@@ -110,7 +112,9 @@ Size2i Window::get_max_size() const {
 void Window::set_min_size(const Size2i &p_min_size) {
 
 	min_size = p_min_size;
-	DisplayServer::get_singleton()->window_set_max_size(max_size, window_id);
+	if (window_id != DisplayServer::INVALID_WINDOW_ID) {
+		DisplayServer::get_singleton()->window_set_min_size(max_size, window_id);
+	}
 	_update_window_size();
 }
 Size2i Window::get_min_size() const {
@@ -270,8 +274,8 @@ void Window::_clear_window() {
 
 	DisplayServer::get_singleton()->delete_sub_window(window_id);
 	window_id = DisplayServer::INVALID_WINDOW_ID;
-	_update_viewport_size();
 
+	_update_viewport_size();
 	VS::get_singleton()->viewport_set_update_mode(get_viewport_rid(), VS::VIEWPORT_UPDATE_DISABLED);
 }