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This is unfortunately a bit of a large commit, but it's at least
pretty much all on-topic for the generalized "contexts" feature.
Rather than waste time trying to split this further into smaller
commits, I'm just landing it as-is, now that I've lived with the
interaction model long enough to not completely hate it.
I fully expect to revisit this in the future. One TODO item in
particular I'd like to note is "sending" windows to contexts
always creates a new virtual desktop for the sent window in the
destination context. What should really happen is the
destination context should be checked for an empty desktop, and a
new desktop created only when there isn't an empty one to be
reused for receiving the sent window. Note this only affects
non-migrate sends, as migrates (modified by Shift) explicitly use
the existing focused desktop at the destination context.
See the README for more information on how contexts work and
what's different about the interaction model. It's fairly
minimal, most of what you already know how to do should keep
working as-is. The only oddity would be Mos1-s no longer
"shelves" windows, it's now a modifier to turn "migrates" into
"sends", and by itself is a noop now.
Colors used for contexts haven't been refined and are enumerated
in src/context_colors.def.
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See changes to README, but basically if you're holding down Alt and doing
some window management operations, while still pressing Alt hit the other
Alt key to return focus to the starting window+desktop. Nothing is undone,
focus is simply returned to the starting window+desktop.
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Major changes from vwm2 include:
- Introduction of integrated X client process and descendants
monitoring in the form of per-window composited overlays.
The rendering is done using the Composite, Damage, and Render
extensions. When the monitors are visible, vwm3 is a compositing
manager. When invisible, vwm3 continues to be an immediate-mode
classic X11 minimalist window manager.
Monitors are toggled via Mod1-;, Mod1-LeftArrow and Mod1-RightArrow
may be used to decrease and increase the sampling frequency,
respectively. Mod1-' clears the monitored tasks history for the
focused window when monitoring is visible.
This feature depends on the CONFIG_CHECKPOINT_RESTORE kernel
configuration option for the discovery of descendant processes.
Without this kernel option enabled, you'll only get a single process
monitored per window; the X client process as indicated by the
_NET_WM_PID atom of the window.
A library called libvmon has been introduced for the abstraction of
lightweight system and process statistics sampling.
Since vwm2 received backported features unrelated to monitoring or
compositing while vwm3 was developed, there isn't really much
difference between the two outside the monitoring context.
This isn't to say there isn't much activity in the code, the addition
of compositing and monitoring requires a substantial amount of code
relative to the scale of vwm[12].
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Major changes from vwm1:
- GNU screen-based "console" integration for monitored launching of X
clients via screen remote commands, replacing the simple double fork
approach used in vwm1. Clients exiting with non-zero status retain
their screen window in the console for 86400 seconds, facilitating
easier debugging and troubleshooting. The console xterm is accessed in
the shelf and has a red border by default.
- Xinerama/multihead support backported from vwm3, including the "screen
fencing" implementation facilitating screen-oriented window focus
cycling.
Shifting the Mod1-Tab window cycling focuses the next most recently
used window on another display. Unshifted stays confined to the
current display.
- SYNC extension integration for prioritizing the WM over other X clients
- setpriority() integration for "nicing" X client processes relative to
the WM process
- "autoconf" windows, horizontal/vertical halfscreen windows,
quarterscreen windows in addition to the full/all screen functions.
Mod1-[ and Mod1-] resize the focused window vertically with left and
right justification to half the screen in width. Shifting these does
the same thing just horizontally. Repeating the operation with a
second ] or [ press quarters the window in the respective screen
corner, extending upon the repeater pattern established in vwm1 for
full/allscreen windows with Mod1-k[k[k]]
- Exit now requires 3 consecutive strikes of Mod1-Esc
- Introduction of a README file
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