improve error handling when begin-world fails

basis/ui/gadgets/worlds/worlds.factor

@@ -4,7 +4,7 @@ USING: accessors arrays assocs continuations kernel math models
 namespaces opengl opengl.textures sequences io combinators
 combinators.short-circuit fry math.vectors math.rectangles cache
 ui.gadgets ui.gestures ui.render ui.backend ui.gadgets.tracks
-ui.commands ui.pixel-formats destructors literals ;
+ui.commands ui.pixel-formats destructors literals strings ;
 IN: ui.gadgets.worlds
 
 CONSTANT: default-world-pixel-format-attributes
@@ -21,7 +21,7 @@ TUPLE: world < track
 TUPLE: world-attributes
     { world-class initial: world }
     grab-input?
-    title
+    { title string initial: "Factor Window" }
     status
     gadgets
     { pixel-format-attributes initial: $ default-world-pixel-format-attributes } ;
@@ -63,7 +63,7 @@ M: world request-focus-on ( child gadget -- )
 : new-world ( class -- world )
     vertical swap new-track
         t >>root?
-        t >>active?
+        f >>active?
         { 0 0 } >>window-loc
         f >>grab-input? ;
 

basis/ui/ui-docs.factor

@@ -40,12 +40,12 @@ HELP: find-window
 { $description "Finds a native window such that the gadget passed to " { $link open-window } " satisfies the quotation, outputting " { $link f } " if no such gadget could be found. The front-most native window is checked first." } ;
 
 HELP: register-window
-{ $values { "world" world } { "handle" "a baackend-specific handle" } }
+{ $values { "world" world } { "handle" "a backend-specific handle" } }
 { $description "Adds a window to the global " { $link windows } " variable." }
 { $notes "This word should only be called by the UI backend.  User code can open new windows with " { $link open-window } "." } ;
 
 HELP: unregister-window
-{ $values { "handle" "a baackend-specific handle" } }
+{ $values { "handle" "a backend-specific handle" } }
 { $description "Removes a window from the global " { $link windows } " variable." }
 { $notes "This word should only be called only by the UI backend, and not user code." } ;
 

basis/ui/ui.factor

@@ -59,22 +59,28 @@ SYMBOL: windows
     [ ?ungrab-input ]
     [ focus-path f swap focus-gestures ] bi ;
 
-: try-to-open-window ( world -- )
+: set-up-window ( world -- )
     {
-        [ (open-window) ]
         [ handle>> select-gl-context ]
-        [
-            [ begin-world ]
-            [ [ handle>> (close-window) ] [ ui-error ] bi* ]
-            recover
-        ]
+        [ [ title>> ] keep set-title ]
+        [ begin-world ]
         [ resize-world ]
+        [ t >>active? drop ]
+        [ request-focus ]
     } cleave ;
 
+: clean-up-broken-window ( world -- )
+    [
+        dup { [ focused?>> ] [ grab-input?>> ] } 1&&
+        [ handle>> (ungrab-input) ] [ drop ] if
+    ] [ handle>> (close-window) ] bi ;
+
 M: world graft*
-    [ try-to-open-window ]
-    [ [ title>> ] keep set-title ]
-    [ request-focus ] tri ;
+    [ (open-window) ]
+    [
+        [ set-up-window ]
+        [ [ clean-up-broken-window ] [ ui-error ] bi* ] recover
+    ] bi ;
 
 : reset-world ( world -- )
     #! This is used when a window is being closed, but also