Get rid of small screen artifacts

[joanna]

Some apps seem to display some very small graphical elements (windows) of the size of 1 or 2 pixels. They just don't look nicely, and so we should consider filtering out any windows of size smaller than, say 5 pixels?

An alternative solution to consider would be to propagate position information back to VMs, when the user moves VM's windows around Dom0 screen? This might also fix some other inaccuracies with positioning of some elements, like e.g. some OpenOffice? menus, etc.

[joanna]

After syncing window position back to AppVM, most of the problems described in this ticket have vanished. However one still remains: it is The White Dot in the left top corner of the screen, which in fact is a 1x1 window that is sometimes created by one of the AppVM's Apps (usually it appears after the user works with firefox for some time). This is the info about the window taken from Dom0 via xwininfo )and then clicking mouse in the left top corner):

[joanna@vaio qubes]$ xwininfo 

xwininfo: Please select the window about which you
          would like information by clicking the
          mouse in that window.

xwininfo: Window id: 0x260006f "Firefox"

  Absolute upper-left X:  0
  Absolute upper-left Y:  0
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 1
  Height: 1
  Depth: 24
  Visual: 0x21
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x20 (installed)
  Bit Gravity State: ForgetGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: yes
  Corners:  +0+0  -1599+0  -1599-899  +0-899
  -geometry 1x1+0+0

If we look at e.g. firefox windows, there are lots of windows of size 1x1, but they all usually have the "Map State" = "IsUnMapped?", rather than IsViewable? like in the case here.

What is interesting is that 1x1 window (The White Dot) is "sticky" in that it appears on all KDE workspaces. Possible reasons and solutions:

1) It's a firefox bug? (I'm yet to track and see if the 1x1 window in the AppVM would have the IsViewable? attribute, or is it overriden by the guid?) -- in that case we might add a check to guid to mkwindow() to no map window of sizes 1x1 and smaller.

2) It's a guid bug -- it somehow overdies the Map State atribute and sets it to IsViewable?, in which case this should be fixed in guid.

[joanna]

Seems like gui-1.1.12 solves this problem :)