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4cbc0b06e2
By putting the WM_TAKE_FOCUS atom in the WM_PROTOCOLS property, SDL
chooses either the "Locally Active" or "Globally Active" input model
depending on the input flag in WM_HINTS.
In order to assist the window manager with making the right decision,
for example, skip this window when choosing what window to activate
next, it will be better if the WM knows right away that the window
accepts or doesn't accept focus (in other words, have either both
the input flag set in WM_HINTS + WM_TAKE_FOCUS or none).
Since the WM_TAKE_FOCUS atom is placed in the WM_PROTOCOLS property, the
WM wanting to adhere to the spec has no choice but send a client message
asking to activate the window and hope for the better.
At quick glance, it appears that the WM_TAKE_FOCUS atom is leftover from
SDL_WINDOWEVENT_TAKE_FOCUS, which was dropped a while ago, and is not
used anymore. So this change removes the WM_TAKE_FOCUS atom to help
window managers such as kwin work better.
(cherry picked from commit 5e8eb0d4e7)
Simple DirectMedia Layer (SDL for short) is a cross-platform library designed to make it easy to write multi-media software, such as games and emulators.
You can find the latest release and additional information at: https://www.libsdl.org/
Installation instructions and a quick introduction is available in INSTALL.md
This library is distributed under the terms of the zlib license, available in LICENSE.txt.
Enjoy!
Sam Lantinga (slouken@libsdl.org)