From 52d75c9b35a8a25fb439dad335716a1a3f6d5007 Mon Sep 17 00:00:00 2001
From: Markus Sauermann <6299227+Sauermann@users.noreply.github.com>
Date: Thu, 10 Nov 2022 18:23:10 +0100
Subject: Fix unsent WINDOW_EVENT_MOUSE_ENTER event on mouse_mode-change

coauthor: @bruvzg

On linuxbsd and macOS the WINDOW_EVENT_MOUSE_ENTER was not sent,
when the mouse became visible again after a mouse_mode-change.
---
 platform/linuxbsd/x11/display_server_x11.cpp | 12 ++++++++++--
 platform/macos/display_server_macos.mm       | 19 +++++++++++++++----
 2 files changed, 25 insertions(+), 6 deletions(-)

diff --git a/platform/linuxbsd/x11/display_server_x11.cpp b/platform/linuxbsd/x11/display_server_x11.cpp
index c3a86c69e1..2e60ad8f45 100644
--- a/platform/linuxbsd/x11/display_server_x11.cpp
+++ b/platform/linuxbsd/x11/display_server_x11.cpp
@@ -376,10 +376,18 @@ void DisplayServerX11::mouse_set_mode(MouseMode p_mode) {
 	}
 
 	// The only modes that show a cursor are VISIBLE and CONFINED
-	bool showCursor = (p_mode == MOUSE_MODE_VISIBLE || p_mode == MOUSE_MODE_CONFINED);
+	bool show_cursor = (p_mode == MOUSE_MODE_VISIBLE || p_mode == MOUSE_MODE_CONFINED);
+	bool previously_shown = (mouse_mode == MOUSE_MODE_VISIBLE || mouse_mode == MOUSE_MODE_CONFINED);
+
+	if (show_cursor && !previously_shown) {
+		WindowID window_id = get_window_at_screen_position(mouse_get_position());
+		if (window_id != INVALID_WINDOW_ID) {
+			_send_window_event(windows[window_id], WINDOW_EVENT_MOUSE_ENTER);
+		}
+	}
 
 	for (const KeyValue<WindowID, WindowData> &E : windows) {
-		if (showCursor) {
+		if (show_cursor) {
 			XDefineCursor(x11_display, E.value.x11_window, cursors[current_cursor]); // show cursor
 		} else {
 			XDefineCursor(x11_display, E.value.x11_window, null_cursor); // hide cursor
diff --git a/platform/macos/display_server_macos.mm b/platform/macos/display_server_macos.mm
index 33d8a8dd14..8b596379a0 100644
--- a/platform/macos/display_server_macos.mm
+++ b/platform/macos/display_server_macos.mm
@@ -1843,11 +1843,22 @@ void DisplayServerMacOS::mouse_set_mode(MouseMode p_mode) {
 		window_id = MAIN_WINDOW_ID;
 	}
 	WindowData &wd = windows[window_id];
+
+	bool show_cursor = (p_mode == MOUSE_MODE_VISIBLE || p_mode == MOUSE_MODE_CONFINED);
+	bool previously_shown = (mouse_mode == MOUSE_MODE_VISIBLE || mouse_mode == MOUSE_MODE_CONFINED);
+
+	if (show_cursor && !previously_shown) {
+		WindowID window_id = get_window_at_screen_position(mouse_get_position());
+		if (window_id != INVALID_WINDOW_ID) {
+			send_window_event(windows[window_id], WINDOW_EVENT_MOUSE_ENTER);
+		}
+	}
+
 	if (p_mode == MOUSE_MODE_CAPTURED) {
 		// Apple Docs state that the display parameter is not used.
 		// "This parameter is not used. By default, you may pass kCGDirectMainDisplay."
 		// https://developer.apple.com/library/mac/documentation/graphicsimaging/reference/Quartz_Services_Ref/Reference/reference.html
-		if (mouse_mode == MOUSE_MODE_VISIBLE || mouse_mode == MOUSE_MODE_CONFINED) {
+		if (previously_shown) {
 			CGDisplayHideCursor(kCGDirectMainDisplay);
 		}
 		CGAssociateMouseAndMouseCursorPosition(false);
@@ -1858,7 +1869,7 @@ void DisplayServerMacOS::mouse_set_mode(MouseMode p_mode) {
 		CGPoint lMouseWarpPos = { pointOnScreen.x, CGDisplayBounds(CGMainDisplayID()).size.height - pointOnScreen.y };
 		CGWarpMouseCursorPosition(lMouseWarpPos);
 	} else if (p_mode == MOUSE_MODE_HIDDEN) {
-		if (mouse_mode == MOUSE_MODE_VISIBLE || mouse_mode == MOUSE_MODE_CONFINED) {
+		if (previously_shown) {
 			CGDisplayHideCursor(kCGDirectMainDisplay);
 		}
 		[wd.window_object setMovable:YES];
@@ -1868,7 +1879,7 @@ void DisplayServerMacOS::mouse_set_mode(MouseMode p_mode) {
 		[wd.window_object setMovable:NO];
 		CGAssociateMouseAndMouseCursorPosition(false);
 	} else if (p_mode == MOUSE_MODE_CONFINED_HIDDEN) {
-		if (mouse_mode == MOUSE_MODE_VISIBLE || mouse_mode == MOUSE_MODE_CONFINED) {
+		if (previously_shown) {
 			CGDisplayHideCursor(kCGDirectMainDisplay);
 		}
 		[wd.window_object setMovable:NO];
@@ -1884,7 +1895,7 @@ void DisplayServerMacOS::mouse_set_mode(MouseMode p_mode) {
 	warp_events.clear();
 	mouse_mode = p_mode;
 
-	if (mouse_mode == MOUSE_MODE_VISIBLE || mouse_mode == MOUSE_MODE_CONFINED) {
+	if (show_cursor) {
 		cursor_update_shape();
 	}
 }
-- 
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