Kick the refresh timer for GAL on Win32 with a terrible hack

common/draw_panel_gal.cpp

@@ -40,6 +40,8 @@
 #include <gal/opengl/opengl_gal.h>
 #include <gal/cairo/cairo_gal.h>
 
+#include <kiplatform/app.h>
+
 #include <tool/tool_dispatcher.h>
 #include <tool/tool_manager.h>
 
@@ -295,6 +297,10 @@ void EDA_DRAW_PANEL_GAL::onSize( wxSizeEvent& aEvent )
 
 void EDA_DRAW_PANEL_GAL::Refresh( bool aEraseBackground, const wxRect* aRect )
 {
+    // Call to ensure the refresh timer eventually fires during rapid mouse moves
+    // Required for win32
+    KIPLATFORM::APP::ForceTimerMessagesToBeCreatedIfNecessary();
+
     if( m_pendingRefresh )
         return;
 

libs/kiplatform/gtk/app.cpp

@@ -50,4 +50,9 @@ void KIPLATFORM::APP::RemoveShutdownBlockReason( wxWindow* aWindow )
 
 void KIPLATFORM::APP::SetShutdownBlockReason( wxWindow* aWindow, const wxString& aReason )
 {
+}
+
+
+void KIPLATFORM::APP::ForceTimerMessagesToBeCreatedIfNecessary()
+{
 }

libs/kiplatform/include/kiplatform/app.h

@@ -64,6 +64,17 @@ namespace KIPLATFORM
          * @param aWindow that has a shutdown block reason set
          */
         void RemoveShutdownBlockReason( wxWindow* aWindow );
+
+        /**
+         * Forces wxTimers to fire more promptly on Win32.
+         *
+         * wxTimers on win32 are not real timers
+         * They live in the message pump at the absolute lowest priority (only when no other events are pending)
+         * This functions "peeks" the message pump which causes them to get queued immediately
+         *
+         * Call as needed in an application to ensure timers are dispatched
+         */
+        void ForceTimerMessagesToBeCreatedIfNecessary();
     }
 }
 

libs/kiplatform/msw/app.cpp

@@ -71,4 +71,12 @@ void KIPLATFORM::APP::SetShutdownBlockReason( wxWindow* aWindow, const wxString&
     ShutdownBlockReasonDestroy( aWindow->GetHandle() ); // Destroys any existing or nonexisting reason
 
     ShutdownBlockReasonCreate( aWindow->GetHandle(), aReason.wc_str() );
+}
+
+
+void KIPLATFORM::APP::ForceTimerMessagesToBeCreatedIfNecessary()
+{
+    // Taken from https://devblogs.microsoft.com/oldnewthing/20191108-00/?p=103080
+    MSG msg;
+    PeekMessage( &msg, nullptr, WM_TIMER, WM_TIMER, PM_NOREMOVE );
 }

libs/kiplatform/osx/app.mm

@@ -50,4 +50,9 @@ void KIPLATFORM::APP::RemoveShutdownBlockReason( wxWindow* aWindow )
 
 void KIPLATFORM::APP::SetShutdownBlockReason( wxWindow* aWindow, const wxString& aReason )
 {
+}
+
+
+void KIPLATFORM::APP::ForceTimerMessagesToBeCreatedIfNecessary()
+{
 }