[Bug 3205464] - handle [wm forget] when the parent is unmapped on windows

The fix for [Bug 2009788] prevented a crash but causes windows to be lost
if their parent is unmapped when [wm forget] is called. Added a test for
this case and ensure that the parent window exists when we remap the
child to its parent.

Reported-by: Koen Danckaert <danckaert@users.sourceforge.net>
Reported-by: Eric Boudaillier <beric@users.sourceforge.net>
Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>

1 files changed, 31 insertions, 0 deletions

diff --git a/tests/winWm.test b/tests/winWm.test
index 7260a06..6b8fc81 100644
--- a/tests/winWm.test
+++ b/tests/winWm.test
@@ -533,6 +533,37 @@ test winWm-9.1 "delayed activation of grabbed destroyed window" -constraints win
     }
     destroy .tx .t .sd
 } -result {ok}
+
+test winWm-9.2 "check wm forget for unmapped parent (#3205464,#2967911)" -setup {
+    destroy .t
+    toplevel .t
+    set winwm92 {}
+    frame .t.f -background blue -height 200 -width 200
+    frame .t.f.x -background red -height 100 -width 100
+} -body {
+    pack .t.f.x
+    pack .t.f
+    set aid [after 1000 {set ::winwm92 timeout}]
+    after 100 {
+        wm manage .t.f
+        wm iconify .t
+        after 100 {
+            wm forget .t.f
+            wm deiconify .t
+            after 100 {
+                pack .t.f
+                after 100 {set ::winwm92 [expr {[winfo rooty .t.f.x] == 0 ? "failed" : "ok"}]}
+            }
+        }
+    }
+    vwait ::winwm92
+    after cancel $aid
+    set winwm92
+} -cleanup {
+    destroy .t.f.x .t.f .t
+    unset -nocomplain winwm92 aid
+} -result ok
+
 destroy .t
 
 # cleanup