[PATCH] gitk: check main window visibility before waiting for it to show

["Tobias Pietzsch via GitGitGadget" <gitgitgadget@gmail.com>]

From: Tobias Pietzsch <pietzsch@mycroft.speedport.ip>

If the main window is already visible when gitk waits for it to
become visible, gitk hangs forever.
This commit adds a check whether the window is already visible.
See https://wiki.tcl-lang.org/page/tkwait+visibility

Signed-off-by: Tobias Pietzsch <pietzsch@mycroft.speedport.ip>
---
    gitk: check main window visibility before waiting for it to show
    
    If the main window is already visible when gitk waits for it to become
    visible, gitk hangs forever.
    
    This commit adds a check whether the window is already visible. See
    https://wiki.tcl-lang.org/page/tkwait+visibility
    
    The symptom of the for-ever waiting is that gitk shows just an empty
    window, like this: https://tinyurl.com/yxr5qlf6 It happens (to me) on
    macOS 11.1 with git-gui installed via homebrew. It doesn't happen on
    macOS 10.14.

Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-944%2Ftpietzsch%2Fmaster-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-944/tpietzsch/master-v1
Pull-Request: https://github.com/git/git/pull/944

 gitk-git/gitk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gitk-git/gitk b/gitk-git/gitk
index 23d9dd1fe0d..cd02b4d50fc 100755
--- a/gitk-git/gitk
+++ b/gitk-git/gitk
@@ -12658,7 +12658,7 @@ catch {
     wm iconphoto . -default gitlogo gitlogo32
 }
 # wait for the window to become visible
-tkwait visibility .
+if {![winfo viewable .]} {tkwait visibility .}
 set_window_title
 update
 readrefs

base-commit: 72c4083ddf91b489b7b7b812df67ee8842177d98
-- 
gitgitgadget