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nxagent: Pass down if window manager has been detected #830

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nxagent: Pass down if window manager has been detected #830

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Commits on Jun 9, 2021

  1. nxagent: Pass down if window manager has been detected 

    At start a rootless nxagent checks if the real X server has a Window
Manager running. It uses a standard detection routine that tries to
select a special input (SubStructureRedirect). As only one client per
X server is allowed to select that input one can deduce from the
success of this operation if a Window Manager is running.

If nxagent is run in rootless mode and has not found a Window Manager
on the real X server it will grab all input (see
Screen.c:nxagentOpenScreen).

If any client of the nxagent runs the standard Window Manager
detection routine against a rootless nxagent it will _not_ see the
Window Manager. If this client happens to be a rootless nxagent again
it will then grab all input which is undesired here. Other clients
might do other undesired stuff in that case.

To avoid all that a rootless nxagent now tries to detect if a client
runs that detection routine and returns the result of its own check to
the client.
    @uli42
    uli42 committed Jun 9, 2021
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