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Ticket UUID:	562c3a3da5b015d810d348292408cd953788c90c
Title:	transient windows don't appear on Windows
Type:	Bug	Version:	8.6.4, 8.6.18, 9.0.5, 9.1b1
Submitter:	gwooledge	Created on:	2015-04-07 14:30:53
Subsystem:	68. Win Window Operations	Assigned To:	nobody
Priority:	5 Medium	Severity:	Minor
Status:	Closed	Last Modified:	2026-10-24 17:42:39
Resolution:	Fixed	Closed By:	nemethi
		Closed on:	2026-10-24 17:42:39
Description:	http://wooledge.org/~greg/tk864-transient is a very stripped-down version of my application, which demonstrates the issue. Double-clicking inside the listbox is supposed to bring up the transient window. This works on Linux, but not on Windows XP Professional 32-bit. (Double-clicking in XP gives no visible result at all.) If I comment out "wm transient .bar .foo" then the window appears. I compiled Tcl 8.6.4 and Tk 8.6.4 using MINGW32. I only had to change one line in Tk: in tk8.6.4/win/tkWinDialog.c I had to comment out #include <shobjidl.h>
User Comments:	nemethi (claiming to be Csaba Nemethi) added on 2026-10-24 17:42:39: Serhiy, many thanks! Merged into main, core-9-0-branch, and core-8-6-branch by commits [b56b1a05], [83373d40], and [8fcd84d4]. serhiy.storchaka added on 2026-09-27 18:06:57: Still reproducible on Windows 11 with 8.6, 9.0 and 9.1, with the script from the description (still available at the link). The command renaming does not matter: a transient withdrawn before its container is mapped cannot be deiconified. toplevel .t1 toplevel .t2 wm transient .t2 .t1 wm withdraw .t2 update wm deiconify .t2 ;# .t2 is not shown `TkWmMapWindow()` returned early for a transient whose container was not mapped, without creating the wrapper, so the window stayed never mapped and `wm deiconify` only recorded the new state. X11 and macOS create the window withdrawn in this case. Proposed fix in branch win-transient-deiconify, with test wm-transient-8.2.