[app_server] font corruption on window resize

[diver]

Font corruption with last item in folder on tracker's window resize. To reproduce:

• open any folder with at least 10 files (the more is better).
• resize this folder to a half size
• scroll down to the last file
• now start to resize down this folder to make upper elements appear.

I will attach screenshot if needed. Tested under vmware with hrev24086

[diver]

This seems to be a dup of #1816.

[aldeck]

After working on #1816, i can now say this not a dup :)

Can still reproduce with hrev28402.

Might also be a bug in Tracker, i'll have a look.

[aldeck]

I noticed it also happens (less often) when not autoscrolling (no need to scroll to the bottom (or right)).

Simply resizing (quickly might help) shows the problem.

Will attach a screenshot to document the ticket.

could be the same as #3037

[Adek336]

​http://dev.haiku-os.org/attachment/ticket/2975/tracker_redraw_problem_2.jpg
To reproduce, open a folder under the Haiku generated files, say, generated/.../add-ons/kernel/network/stack, delete one of the files, sort by newest on top, make the window small like showing two files only so that the vertical scrollbar appears, scroll to somewhere near the bottom, in the background do jam -q in src/add-ons/kernel/network/stack directory, click on the vertical scrollbar in Tracker window, start moving it slowly a little up and down. While the folder contents are updated, problem is reproduced.
checked on hrev28884

[Adek336]

borrowed from #2975

[stippi]

#3037 is unrelated. This problem is not fixed hrev30033.

[stippi]

Fixed in hrev30068.