Fix focus changing when unminimising on X11

In f220e3b0783a24a6c7195f170297cf4b12a29d85 I made the keyboard
focus move to the places and terminal panel whenever they are
toggled visible. Unfortunately the QDockWidget::visibilityChanged()
signal is also emitted (at least on X11) simply when the window
containing that panel is minimized or restored. This commit
overrides the QDockWidget::event() method to ignore such
spontaneous show or hide events so QDockWidget won't emit the
visibilityChanged() signal then.

BUG: 497803

2 files changed, 23 insertions, 0 deletions

diff --git a/src/dolphindockwidget.cpp b/src/dolphindockwidget.cpp
index 930c38e35..5e79e0316 100644
--- a/src/dolphindockwidget.cpp
+++ b/src/dolphindockwidget.cpp
@@ -6,6 +6,7 @@
 
 #include "dolphindockwidget.h"
 
+#include <QEvent>
 #include <QStyle>
 
 namespace
@@ -77,5 +78,21 @@ bool DolphinDockWidget::isLocked() const
     return m_locked;
 }
 
+bool DolphinDockWidget::event(QEvent *event)
+{
+    switch (event->type()) {
+    case QEvent::Show:
+    case QEvent::Hide:
+        if (event->spontaneous()) {
+            // The Dolphin window has been minimized or restored. We do not want this to be interpreted like a user was toggling the visibility of this widget.
+            // We return here so no QDockWidget::visibilityChanged() signal is emitted. This does not seem to happen either way on Wayland.
+            return true;
+        }
+        [[fallthrough]];
+    default:
+        return QDockWidget::event(event);
+    }
+}
+
 #include "dolphindockwidget.moc"
 #include "moc_dolphindockwidget.cpp"
diff --git a/src/dolphindockwidget.h b/src/dolphindockwidget.h
index 114a11b55..127525b5a 100644
--- a/src/dolphindockwidget.h
+++ b/src/dolphindockwidget.h
@@ -27,6 +27,12 @@ public:
     void setLocked(bool lock);
     bool isLocked() const;
 
+protected:
+    /**
+     * Make sure we do not emit QDockWidget::visibilityChanged() signals whenever Dolphin's window is minimized or restored.
+     */
+    bool event(QEvent *event) override;
+
 private:
     bool m_locked;
     QWidget *m_dockTitleBar;