According to the ICCCM, clients should send a synthetic unmap event when they
initiate an unmap. The old code waited for these synthetic unmaps to unmanage
windows. However, certain 'obsolete' clients do not send synthetic unmaps
(notably xpdf's find dialog). These windows entered a zombified state: xmonad
does not manage them, yet they are still mapped and raised on screen.
The new algorithm (derived from wmii):
- track windows that are mapped on screen
- track the number of expected unmap events for each window, increment every
time 'hide' is called on a window that is not mapped.
- decrement the expected unmap counter on each unmap event
- treat an unmap event as genuine (ie. unmap the window) when:
- the event is synthetic (per ICCCM)
- OR there are no expected unmap events for this window
When resuming, we were (implicitly) relying on 'scan' to find all
windows, and reset their event masks and WM_STATE. When we moved to
Iconfified hidden workspaces, 'scan' would only find and reset states on
the current workspace.
The result being that hidden workspace windows no longer received
enterNotify events.
Fix this by traversing the StackSet serialised during a restart, setting
the intial X states for each window, whether visible or hidden.
Note that this breaks compatibility with certain programs described as
"obsolete" in the ICCCM (1994). See the command above the UnmapEvent handler
for details.
Xmonad now implements resize requests in a consistent manner.
* If the window is FLOATING, we implement the program's request, and
correctly update the StackSet; so it will keep the new size. This
should work correctly even for non-current windows.
* Otherwise, we ignore the request. As per ICCCM, we send a fake
ConfigureNotify containing the new (unchanged) geometry. This is
perfectly ICCCM compliant, and if it breaks your client, it's your
own fault.
This patch requires setConfigureEvent, which is added to X11-extras by
a patch approximately contemporaneous with this one.
