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In a prior commit (38e00280e9d17282717595a05411736a308804c0), I added
support to stick applets to the center of the panel, so that no matter the
width of the applet or the panel, the applet would always stay at the
center of the panel. That commit also added an "end-relative" mode, which
is similar to the panel's old "right-stick" feature, except end-relative
mode positions the applet's right edge relative to the panel's right edge,
whereas right-sticking positioned the applet's left edge relative to the
right edge of the panel. The advantage of end-relative positioning is
that the applet can resize without moving itself even further to the right
than the user intended, whereas if positioned so that there is empty space
between the applet and the edge of the panel, right-stuck applets would
change the size of that gap (or close it entirely) when the applet
resized.
Unfortunately, I have since discovered that my original implementation of
the center-stick and end-relative positioning of applets was inadequate.
Some applets can accept any amount of space between a minimum and their
"preferred" size -- if such an applet cannot be allocated its preferred
size (perhaps because panel space is scarce), then the applet will be
allocated as much space as is available, and the applet will "flex" itself
to compensate. Some examples of these "expanding" applets include the
Window List (a component of the wncklet included in this package) and the
MATE Dock Applet (a third-party panel applet from the Ubuntu MATE
project). When writing my original center-stick code, I did not properly
take expanding applets into account, and with my original commit, such
applets were off-center -- usually way off-center since the code seemed to
position such applets based on their minimum size, rather than their
actual allocated size.
This commit adds center-sticking support for expanding applets. It also
works with end-relative expanding applets -- such applets will expand
towards the left, thus keeping their right-relative position intact.
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Conventionally, the applets on a MATE Panel are positioned relative to the
left edge of the panel (if the panel is horizontal) or the top edge (if the
panel is vertical). There has also been some (buggy) support for positioning
of applets relative to the right (or bottom) edge of the panel, so that
applets on the right side of the panel will stay on the right side even if
the user changes screen resolutions or if the panel changes size for some
other reason.
However, many users want to also place applets at or near the center of their
panel(s). There is no such conventional support for positioning applets
relative to the center of the panel, so users have positioned applets near
the center of the panel -- but the position recorded is relative to the left
side of the panel. As such, the applets will almost certainly shift over
to the left or right slightly if the panel is ever resized, and the user will
have to reposition all those centered applets yet again. This is especially
frustrating if the user switches monitors on a regular basis!
This patch radically revamps the MATE Panel's positioning framework, and
deprecates the original "right-stick" feature. To replace the right-stick
feature, this patch instead associates an "edge relativity" setting with
each and every panel applet: An applet can be relative to the start (left/
top), end (right/bottom), or center of the panel. This setting can be
changed using DConf/GSettings, using a custom panel layout file, or even
by simply dragging the applet to the appropriate place on the panel.
(Conventionally, applets are not even right-stuck automatically even when the
user drags the applet over to the far right of the panel!) As a bonus, when
the user drags an applet across the center of the panel, the applet will
temporarily "stick" to the very center of the panel, to allow the user to
very precisely align any applet they wish.
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Fixes https://github.com/mate-desktop/mate-desktop/issues/478
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This prevents duplication of tray icons
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In addition to existing properties set also new _GNOME_WM_STRUT_AREA
property that allows creating struts between monitors.
https://mail.gnome.org/archives/wm-spec-list/2018-December/msg00000.html
https://gitlab.freedesktop.org/xdg/xdg-specs/merge_requests/22
https://gitlab.gnome.org/GNOME/gnome-panel/merge_requests/3
Upscale area strut because of 73e025b0eab94fe06cdafee61c347fb5fe6f7545
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