Our current approach to handling the focused/active view is a bit
confusing. In particular, it's hard to be sure when server->focused_view
is or isn't in sync with the real wlroots keyboard focus.
Try to clean things up a bit. In particular:
- Add comments to server->focused_view and desktop_focused_view() to
clarify that they should match, but it's not guaranteed.
- desktop_focused_view() now prints a warning if it detects that
server->focused_view is out of sync. We should keep an eye out for
this warning, and if we see it, try to figure out why it happened.
- For consistency, use only "focus/defocus" as the verbs in function
names rather than "activate". This is a bit arbitrary, but the idea is
that focus is the primary action while the active/inactive state is a
side effect.
- view_focus/defocus() replace view_set_activated() and now update both
focus and active/inactive state, to try to keep them in sync.
- Add comments at view_focus/defocus() to warn against calling them
directly (we should generally call the desktop.c functions).
- desktop_focus_view(NULL) is now forbidden and is no longer handled as
a special case to clear the focus. This was (at least to me) a
surprising behavior and caused trouble when working on another change.
- To maintain existing behavior, desktop_focus_topmost_mapped_view() now
explicitly clears the focus if there are no mapped views.
There should be no behavioral change here.
...to share common code with minimize_sub_views()
Also, fix a bug in the move-to-back functions to move the window
hierarchy in the right order.
Helped-by: @Consolatis
Two types of window rules are supported, actions and properties. They are
defined as shown below.
<windowRules>
<!-- Action -->
<windowRule identifier="some-application">
<action name="Maximize"/>
</windowRule>
<!-- Property -->
<windowRule identifier="foo*" serverDecoration="yes|no"/>
</windowRules>
Rules are applied if windows match the criteria defined by the
'identifier' attribute which relates to app_id for native Wayland windows
and WM_CLASS for XWayland clients.
Matching against patterns with '*' (wildcard) and '?' (joker) is
supported.
Add 'serverDecoration' property.
view_minimize() does not need to call desktop_move_to_back() because the
stacking order is not changed and the windowSwitcher uses the scene-tree
nodes anyway.
Note: Movement of xwayland sub-views still relies on keeping server->views
in sync with z-order
Currently, we anchor the right/bottom edge of the view whenever the top/
left edge is moving (current.x/y != pending.x/y). Doing so doesn't make
much sense when the right/bottom edge is also moving. In that case it's
probably best to move the view (or at least its top/left corner)
directly to its final position.
The most noticeable effect of this change is with views that don't
accept their requested size exactly when tiled or maximized (examples:
havoc, xfce4-terminal). Previously, their right-bottom corner would be
aligned with the screen edge, leaving gaps on the left and top. Now the
top-left corner will be aligned and the gaps will be on the right and
bottom. This is still not ideal, but IMHO less surprising to the user.
...to increase xwayland and xdg-shell encapsulation and to avoid passing a
function pointer as an argument in `xwayland_move_sub_views_to_front()`
which is inconsistent with labwc design patterns.
Rename view-impl.c to view-impl-common.c
Move function declarations that are common to view-implementations from
view.h into view-impl-common.h
