fix: only invalidate buffers for chat windows (#5666)

src/widgets/BaseWindow.cpp

@@ -877,10 +877,13 @@ bool BaseWindow::nativeEvent(const QByteArray &eventType, void *message,
         break;
 
         case WM_DPICHANGED: {
-            // wait for Qt to process this message
-            postToThread([] {
-                getApp()->getWindows()->invalidateChannelViewBuffers();
-            });
+            if (this->flags_.has(ClearBuffersOnDpiChange))
+            {
+                // wait for Qt to process this message
+                postToThread([] {
+                    getApp()->getWindows()->invalidateChannelViewBuffers();
+                });
+            }
         }
         break;
 

src/widgets/BaseWindow.hpp

@@ -37,6 +37,7 @@ public:
         Dialog = 1 << 6,
         DisableLayoutSave = 1 << 7,
         BoundsCheckOnShow = 1 << 8,
+        ClearBuffersOnDpiChange = 1 << 9,
     };
 
     enum ActionOnFocusLoss { Nothing, Delete, Close, Hide };

src/widgets/DraggablePopup.cpp

@@ -36,9 +36,9 @@ namespace {
 
 DraggablePopup::DraggablePopup(bool closeAutomatically, QWidget *parent)
     : BaseWindow(
-          closeAutomatically
-              ? popupFlagsCloseAutomatically | BaseWindow::DisableLayoutSave
-              : popupFlags | BaseWindow::DisableLayoutSave,
+          (closeAutomatically ? popupFlagsCloseAutomatically : popupFlags) |
+              BaseWindow::DisableLayoutSave |
+              BaseWindow::ClearBuffersOnDpiChange,
           parent)
     , lifetimeHack_(std::make_shared<bool>(false))
     , dragTimer_(this)

src/widgets/OverlayWindow.cpp

@@ -7,6 +7,7 @@
 #include "singletons/Emotes.hpp"
 #include "singletons/Settings.hpp"
 #include "singletons/WindowManager.hpp"
+#include "util/PostToThread.hpp"
 #include "widgets/BaseWidget.hpp"
 #include "widgets/helper/ChannelView.hpp"
 #include "widgets/helper/InvisibleSizeGrip.hpp"
@@ -312,6 +313,13 @@ bool OverlayWindow::nativeEvent(const QByteArray &eventType, void *message,
         }
         break;
 #    endif
+        case WM_DPICHANGED: {
+            // wait for Qt to process this message, same as in BaseWindow
+            postToThread([] {
+                getApp()->getWindows()->invalidateChannelViewBuffers();
+            });
+        }
+        break;
 
         default:
             return QWidget::nativeEvent(eventType, message, result);

src/widgets/Window.cpp

@@ -52,7 +52,9 @@
 namespace chatterino {
 
 Window::Window(WindowType type, QWidget *parent)
-    : BaseWindow(BaseWindow::EnableCustomFrame, parent)
+    : BaseWindow(
+          {BaseWindow::EnableCustomFrame, BaseWindow::ClearBuffersOnDpiChange},
+          parent)
     , type_(type)
     , notebook_(new SplitNotebook(this))
 {