Avoid unnecessary wWindowConfigure().
If a window handles a ConfigureRequest which did not specify a move or
resize operation we should not call wWindowConfigure() and save the
window geometry.
Sergey Popov reported a scenario in which the old behaviour caused a bug:
* Start gvim with a server.
"gvim --servername qwe .gimvrc"
* Maximize gvim.
* (Re)open a file in the same window
"gvim --servername qwe --remote-silent .gvimrc"
* Now the window claims to be unmaximized and its old geometry is
forgotten.
The bug was that when the gvim window reread the file it generated a
ConfigureRequest without specifying a geometry change but we called
wWindowConfigure() and saved its geometry as though it had been
maximized.