Improve mouse handling code in wxAuiToolBar.

Capture the mouse to handle mouse input on the buttons to ensure we always
reset the button when the mouse leaves it.

Closes #11784.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65669 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/aui/auibar.h

@@ -616,6 +616,7 @@ protected: // handlers
     void OnMiddleUp(wxMouseEvent& evt);
     void OnMotion(wxMouseEvent& evt);
     void OnLeaveWindow(wxMouseEvent& evt);
+    void OnCaptureLost(wxMouseCaptureLostEvent& evt);
     void OnSetCursor(wxSetCursorEvent& evt);
 
 protected:
@@ -657,6 +658,10 @@ protected:
     wxSize m_horzHintSize;
     wxSize m_vertHintSize;
 
+private:
+    // Common part of OnLeaveWindow() and OnCaptureLost().
+    void DoResetMouseState();
+
     DECLARE_EVENT_TABLE()
     DECLARE_CLASS(wxAuiToolBar)
 };