allow tiling windows that start in full-screen (fixes #79)

src/lib/world/Clients.ts

@@ -5,8 +5,8 @@ namespace Clients {
     ];
 
     export function canTileEver(kwinClient: KwinClient) {
-        return kwinClient.moveable &&
-            kwinClient.resizeable &&
+        const shapeable = (kwinClient.moveable && kwinClient.resizeable) || kwinClient.fullScreen; // full-screen windows may become shapeable after exiting full-screen mode
+        return shapeable &&
             !kwinClient.popupWindow &&
             !prohibitedClasses.includes(kwinClient.resourceClass);
     }

src/lib/world/clientState/Tiled.ts

@@ -160,7 +160,15 @@ namespace ClientState {
             });
 
             manager.connect(kwinClient.fullScreenChanged, () => {
-                world.do(() => window.onFullScreenChanged(kwinClient.fullScreen));
+                world.do((clientManager, desktopManager) => {
+                    // some clients only turn out to be untileable after exiting full-screen mode
+                    if (!Clients.canTileEver(kwinClient)) {
+                        clientManager.floatClient(client);
+                        return;
+                    }
+
+                    window.onFullScreenChanged(kwinClient.fullScreen);
+                });
             });
 
             manager.connect(kwinClient.tileChanged, () => {

src/tests/units/world/Clients.ts

@@ -4,6 +4,7 @@ tests.register("Clients.canTileEver", 1, () => {
         { clientProperties: { resourceClass: "app", caption: "Title", moveable: false }, tileable: false },
         { clientProperties: { resourceClass: "app", caption: "Caption", resizeable: false }, tileable: false },
         { clientProperties: { resourceClass: "app", caption: "Caption", normalWindow: false, popupWindow: true }, tileable: false },
+        { clientProperties: { resourceClass: "app", caption: "Caption", moveable: false, resizeable: false, fullScreen: true }, tileable: true },
         { clientProperties: { resourceClass: "ksmserver-logout-greeter", caption: "Caption" }, tileable: false },
         { clientProperties: { resourceClass: "xwaylandvideobridge", caption: "" }, tileable: false },
     ];
@@ -24,6 +25,7 @@ tests.register("Clients.canTileEver", 1, () => {
             pid: 100,
             moveable: true,
             resizeable: true,
+            fullScreen: false,
             popupWindow: false,
             minimized: false,
             desktops: [1],