[Tcl-bugs] [ tktoolkit-Bugs-3531403 ] ttk.Scrollbar in Notebook widget freezes

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Bugs item #3531403, was opened at 2012-06-01 11:35
Message generated for change (Tracker Item Submitted) made by davidjamesbeck
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Category: 88. Themed Tk
Group: current: 8.5.11
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: djbeck (davidjamesbeck)
Assigned to: Joe English (jenglish)
Summary: ttk.Scrollbar in Notebook widget freezes

Initial Comment:
I am working on an iMac running OS 10.7, TK 8.5.11. I built a simple app containing a Notebook widget, and with Listboxes and linked tkk.Scrollbars on each of three tabs. All of the Scrollbars work the first time I manipulate them, but once the Scrollbar on third tab (the last one created by the script) is manipulated, the others become unresponsive to mouse clicks (though the Scrollbars continue to move when the Listboxes are scrolled using the mouse/trackpad. I first found this issue working with Python 3.2.3 (using IDLE), but the same thing happens with Python 3.3. The problem was recreated by someone on the Python Bug Report list using the same system configuration. I asked someone to try this on a PC (Windows 7, Python 3.2.3, Tkinter 8.5), but the problem wasn't recreated.


After playing around with this a bit more, I've found that if the Scrollbars on the different tabs are not aligned (that is, they don't occupy the same EW position in the frame) the effect disappears. I thought that might mean that the last Scrollbar "persists" when you go back to earlier tabs, but the position of the slider in a frozen Scrollbar isn't necessarily the same as the position the last Scrollbar is left in (that is, after you manipulate the Scrollbar that causes the others to freeze, the frozen sliders are still in the configuration they were left in previously, so we're not just seeing a "ghost" of a scrollbar on another tabs).

Another data point: Someone from the Python group tried the same test using a Python 3.2.3 linked with an X11 Tk 8.5 (MacPorts) rather than the ActiveState Cocoa Tk 8.5.11 (python.org Python).  I was not able to get the test to fail with X11 Tk so that tends to support the idea that the root cause is somewhere in Aqua Tk.


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