[TCLCORE] TIP #552 changes to ttk::treeview

[Schelte B. <tc...@tc...>]

All,

While merging the fix for bug d82fa2953a into Tk 8.7 and 9.0, I noticed 
that a change had been made where now all treeview items are always 
drawn by DrawForest() when in the past (i.e. Tk 8.6) only the visible 
items would be drawn. This seems like it may cause some performance 
degradation on treeview widgets with a lot of items. Especially since 
the widget is redrawn quite frequently in response to mouse or keyboard 
activity. I did not measure how much of a performance degradation this 
causes, but I couldn't help but wonder if it is really necessary to 
redraw lots of items over and over when they aren't visible anyway.

I also found that some changes to entry.test and spinbox.test had not 
been merged from Tk core-8-branch to trunk. As I was unsure why that was 
omitted, I excluded them from my merge. I don't know if that means they 
are now being ignored by fossil for future merges. If that is the case 
and these changes should make it into 9.0, manual action may be needed.


Schelte