fix: minimize button remaining hovered on Windows (Chatterino#5175)

CHANGELOG.md

@@ -65,7 +65,7 @@
 - Bugfix: Fixed rare crash with Image Uploader when closing a split right after starting an upload. (#4971)
 - Bugfix: Fixed an issue on macOS where the image uploader would keep prompting the user even after they clicked "Yes, don't ask again". (#5011)
 - Bugfix: Hide the Usercard button in the User Info Popup when in special channels. (#4972)
-- Bugfix: Fixed support for Windows 11 Snap layouts. (#4994)
+- Bugfix: Fixed support for Windows 11 Snap layouts. (#4994, #5175)
 - Bugfix: Fixed some windows appearing between screens. (#4797)
 - Bugfix: Fixed a crash that could occur when using certain features in a Usercard after closing the split from which it was created. (#5034, #5051)
 - Bugfix: Fixed a crash that could occur when using certain features in a Reply popup after closing the split from which it was created. (#5036, #5051)

src/widgets/BaseWindow.cpp

@@ -962,6 +962,13 @@ bool BaseWindow::handleSIZE(MSG *msg)
                           QPoint(rect.right - 1, rect.bottom - 1));
             }
             this->useNextBounds_.stop();
+
+            if (msg->wParam == SIZE_MINIMIZED && this->ui_.titlebarButtons)
+            {
+                // Windows doesn't send a WM_NCMOUSELEAVE event when clicking
+                // the minimize button, so we have to emulate it.
+                this->ui_.titlebarButtons->leave();
+            }
         }
     }
     return false;