breeze/0001-Fix-informing-the-underlying-widget-when-leaving-Spl.patch

From 96eecd246771bf9db425e9be758401494d4d2131 Mon Sep 17 00:00:00 2001
From: Fabian Vogt <fabian@ritter-vogt.de>
Date: Sat, 15 May 2021 17:45:54 +0200
Subject: [PATCH] Fix informing the underlying widget when leaving
 SplitterProxy

While the SplitterProxy is active, it intercepts all relevant events, so that
the underlying widget still thinks it's in the same "on splitter" state. When
the SplitterProxy is left, the underlying widget is sent a HoverLeave/HoverMove
event to make it aware of the new current cursor position. Without this, it
doesn't know that it's not supposed to be in the "on splitter" state, and when
it regains focus it just re-activates the SplitterProxy at the current cursor
position.

This was broken by accident in d201a1f187 ("Fix SplitterProxy not clearing
when above another QSplitterHandle"), which moved the hide() call past the
call to QCoreApplication::sendEvent. Previously that made isVisible() false,
which also prevented the interception of the HoverLeave/HoverMove events.

BUG: 436473
(cherry picked from commit f99b7ef621c9c69544158d245699fd8104db6753)
---
 kstyle/breezesplitterproxy.cpp | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/kstyle/breezesplitterproxy.cpp b/kstyle/breezesplitterproxy.cpp
index 0cf5685f..d4db407b 100644
--- a/kstyle/breezesplitterproxy.cpp
+++ b/kstyle/breezesplitterproxy.cpp
@@ -341,11 +341,14 @@ namespace Breeze
         // send hover event
         if( _splitter )
         {
-            QHoverEvent hoverEvent(
-                qobject_cast<QSplitterHandle*>(_splitter.data()) ? QEvent::HoverLeave : QEvent::HoverMove,
-                _splitter.data()->mapFromGlobal(QCursor::pos()), _hook);
-            QCoreApplication::sendEvent( _splitter.data(), &hoverEvent );
+            // SplitterProxy intercepts HoverLeave/HoverMove events to _splitter,
+            // but this is meant to reach it directly. Unset _splitter to stop interception.
+            auto splitter = _splitter;
             _splitter.clear();
+            QHoverEvent hoverEvent(
+                qobject_cast<QSplitterHandle*>(splitter.data()) ? QEvent::HoverLeave : QEvent::HoverMove,
+                splitter.data()->mapFromGlobal(QCursor::pos()), _hook);
+            QCoreApplication::sendEvent( splitter.data(), &hoverEvent );
         }
 
         // kill timer if any
-- 
2.25.1