Robust modal activation; ensure showing activated

...window

REVIEW: 123875
BUG: 348083

abstract_client.h

@@ -217,6 +217,8 @@ public:
     virtual bool isCloseable() const = 0;
     // TODO: remove boolean trap
     virtual bool isShown(bool shaded_is_shown) const = 0;
+    // TODO: remove boolean trap
+    virtual void hideClient(bool hide) = 0;
     virtual bool isFullScreenable() const = 0;
     virtual bool isFullScreen() const = 0;
     // TODO: remove boolean trap

activation.cpp

@@ -311,6 +311,9 @@ void Workspace::activateClient(AbstractClient* c, bool force)
     if (c->isMinimized())
         c->unminimize();
 
+    // ensure the window is really visible - could eg. be a hidden utility window, see bug #348083
+    c->hideClient(false);
+
 // TODO force should perhaps allow this only if the window already contains the mouse
     if (options->focusPolicyIsReasonable() || force)
         requestFocus(c, force);
@@ -354,11 +357,10 @@ void Workspace::takeActivity(AbstractClient* c, ActivityFlags flags)
     if (flags & ActivityFocus) {
         AbstractClient* modal = c->findModal();
         if (modal != NULL && modal != c) {
-            if (!modal->isOnDesktop(c->desktop())) {
+            if (!modal->isOnDesktop(c->desktop()))
                 modal->setDesktop(c->desktop());
-                if (modal->desktop() != c->desktop())  // forced desktop
-                    activateClient(modal);
-            }
+            if (!modal->isShown(true) && !modal->isMinimized())  // forced desktop or utility window
+                activateClient(modal);   // activating a minimized blocked window will unminimize its modal implicitly
             // if the click was inside the window (i.e. handled is set),
             // but it has a modal, there's no need to use handled mode, because
             // the modal doesn't get the click anyway

client.h

@@ -356,7 +356,7 @@ public:
     /// Updates visibility depending on being shaded, virtual desktop, etc.
     void updateVisibility();
     /// Hides a client - Basically like minimize, but without effects, it's simply hidden
-    void hideClient(bool hide);
+    void hideClient(bool hide) override;
     bool hiddenPreview() const; ///< Window is mapped in order to get a window pixmap
 
     virtual bool setupCompositing();

shell_client.cpp

@@ -296,6 +296,10 @@ bool ShellClient::isShown(bool shaded_is_shown) const
     return !m_closing && !m_unmapped;
 }
 
+void ShellClient::hideClient(bool hide)
+{
+}
+
 void ShellClient::maximize(MaximizeMode mode)
 {
     if (m_maximizeMode == mode) {

shell_client.h

@@ -72,6 +72,7 @@ public:
     bool isMovableAcrossScreens() const override;
     bool isResizable() const override;
     bool isShown(bool shaded_is_shown) const override;
+    void hideClient(bool hide) override;
     void maximize(MaximizeMode) override;
     MaximizeMode maximizeMode() const override;
     bool noBorder() const override;