xcb: Treat bitmap cursors differently from shaped cursors

QXcbCursor had a "cache" of cursor handles. Unfortunately, as QXcbCursor has its
lifetime tied to the screen, this cache grew unbounded whenever the cursor was
set: this could be witnessed worst when repeatedly setting the current cursor to
a different pixmap each time.

We fix this by keeping the cursor cache only for the "regular" shaped cursors
that are often shared between windows, working on the assumption that custom
cursors are generally specific only to a given window. This makes the lifetime
of the bitmap cursors much more clear: they are tied to that window, and when
the window is destroyed (or changes cursor), so too is the bitmap cursor
destroyed (if set).

Reported-by: Will Thompson <wjt@endlessm.com>
Change-Id: Ia558d858ff49e89cd5220344567203eb0267a133
Reviewed-by: Uli Schlachter <psychon@znc.in>
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

0 files changed, 0 insertions, 0 deletions