Clear cursor cache on theme changes

The WaylandCursorTheme emits a signal whenever it reloads the theme.
This is used by CursorImage to clear the cache and reload decoration
and fallback cursor.

pointer_input.cpp

@@ -509,6 +509,16 @@ CursorImage::CursorImage(PointerInputRedirection *parent)
     connect(ScreenLocker::KSldApp::self(), &ScreenLocker::KSldApp::lockStateChanged, this, &CursorImage::reevaluteSource);
     connect(m_pointer, &PointerInputRedirection::decorationChanged, this, &CursorImage::updateDecoration);
     loadThemeCursor(Qt::ArrowCursor, &m_fallbackCursor);
+    if (m_cursorTheme) {
+        connect(m_cursorTheme, &WaylandCursorTheme::themeChanged, this,
+            [this] {
+                m_cursors.clear();
+                loadThemeCursor(Qt::ArrowCursor, &m_fallbackCursor);
+                updateDecorationCursor();
+                // TODO: update effects
+            }
+        );
+    }
     m_surfaceRenderedTimer.start();
 }
 

wayland_cursor_theme.cpp

@@ -67,6 +67,7 @@ void WaylandCursorTheme::loadTheme()
     }
     m_theme = wl_cursor_theme_load(c->themeName().toUtf8().constData(),
                                    size, m_shm->shm());
+    emit themeChanged();
 }
 
 void WaylandCursorTheme::destroyTheme()

wayland_cursor_theme.h

@@ -47,6 +47,9 @@ public:
 
     wl_cursor_image *get(Qt::CursorShape shape);
 
+Q_SIGNALS:
+    void themeChanged();
+
 private:
     void loadTheme();
     void destroyTheme();