Interim fixes

See merge request !39

Otherwise the overlays will no tbe drawn.

Closes: #1300
(cherry picked from commit 175ccc25)

Prior to this commit, setting up a zero timeout resulted in a timer that never
expires, which isn't particularly useful.

This commit allows setting up timers that expire immediately, which is useful
to immediately enter idle state.

(cherry picked from commit 3cb4ff3f)

Docs updates

See merge request !32

Contributing: we want to base our feature branches on master

See merge request Librem5/wlroots!33

Feature branches should (whenver possible) be based on upsteam's master
since

 - it eases upstream adoption
 - it makes sure features stay well separated

rootston: Keep older anchored layers near anchor points

See merge request !30

Layer surfaces are attached to edges of the screen starting with the youngest, causing new ones to always displace existing ones. This changes the order to oldest first, keeping the positions more often.

(cherry picked from commit e9e65c54)

Upstream as of 2f484537

See merge request !29

Update librem5 from f/gitlab-ci

See merge request !28

Needed for the screencopy example that will be pulled in with our next
update from upstream's master as of
a7a96d76.

Build it once with and without xwayland so we're sure both work

Fixes examples/dmabuf-capture being built with unmet dependencies

Even if the libav* variables were disabler objects, the build targer
dmabuf-capture was being built. Modified the script to support a generic
solution.

Add minimal app switcher protocol

See merge request !16

Simple private protocoll to list and raise toplevels by app_id and
title. We wanted a minimal set of objects, requests and events. Since
this is only meant for the app overview page in the shell we can take
many shortcuts and leave out e.g. XWayland for the moment.

This will be replaced by wlr_foreign_toplevel_unstable_v1 later on.

We don't rename the request itself since we don't want to change the
protocol.

docs: Add librem5 contribution guide

See merge request !15

This makes it better match the protocol name. Also name the
variables consistently "phosh" instead of the overused "shell".

It doesn't look like there's any motion on a fix from the AMDGPU side,
and using the legacy interface for this isn't so bad.

rootston/surface_layers: fix clicking after surface moved

Init the new destroy signals added by #1200

Add destroy signals to types that are destroyed by wl_display_destroy

introduce wlr_output_layout_farthest_output

Similar to wlr_output_layout_adjacent_output but will return the
one that is the farthest away from the reference in given direction.

Fix meson changes

This fixes building wlroots as a subproject.

This reverts commit 9c886f20.

This breaks wlroots when used as a meson subproject.

This reverts commit dea31199, reversing
changes made to 6db9c4b7.

Build system changes

Layer surfaces are not notified of cursor position changes if the surface moves, only if the cursor moves. This workaround emits a cursor position event every time a cursor ends up over a newly resized layer surface to make sure the following clicks land in the right place.

This change doesn't address sending leave events when a cursor previously present over the surface becomes away.

There are 2 separate mechanisms in play, because a layer surface gets resized in 2 steps:

1. Layer surface resize & rearrange.
2. Underlying surface resize.

The first step may affect all layer surfaces. The cursor events are sent to cursors placed over all layer surfaces which have moved (not been resized). The second step affects any layer surface whose surface changed size. The cursor event is sent only to that surface.

Together, these events cover all surfaces: those which moves, and those which changed size, as long as each layer surface resize is accompanied by an immediate surface resize.

This stops the protocol header constantly being regenerated for every
target using them.

This is so we can potentially add comments to it, and so if a user looks
at the installed header, they can see the /* #undef WLR_HAS_FEATURE */
line to see every option, even if not available.