Allow dragging tiled windows with the mouse. (#3085)

Fixes #2643

Inner drop region behaves like move to mark.
The outer region is close to the edge (currently 30px from the edge).
This will place the container as a sibling in the given direction within
the parent container. If the move direction goes against the orientation
of the parent container, tree_move() is called.

Contributors:
Co-authored-by: Orestis Floros <orestisflo@gmail.com>
See #3085
- Inner drop region behaves like move to mark
- Handle workspaces
- Fix crash when target closes
- Initiate tiling drag from titlebar
- Hide indicator until container is dragged outside of original position
- Calculate outer_threshold using percentages instead of fixed pixel
values
- Emit 'move' event properly
- Don't focus previously unfocused containers
- Use tree_split() on different orientation
- Fix redundant split containers
- DT_PARENT
- Readability & optimizations
- Limit parent threshold by render_deco_height()
- Tests
- Fullscreen container handling
- Initiate drag from title bar
- Fix issue of EnterNotify events still triggering after drag_callback
  is called
- Include decorations for drop target calculation

Co-authored-by: Michael Forster <email@michael-forster.de>
See #2178
- Original implementation of tiling drag + indicator window
> A container can be dragged by the title bar to one of the four sides
> of another container. That container will then be split either
> horizontally or vertically.

Co-authored-by: Tony Crisci <tony@dubstepdish.com>
See #2653
- Original implementation of outer/inner drop region indicator:
> There are two drop regions per direction.
>
> The inner region is closer to the center of the window. Dropping on
> this region will split the target container and put the container
> within the split at the given direction beside the target container.
>
> The outer region is close to the edge (currently 30px from the edge).
> This will place the container as a sibling in the given direction within
> the parent container.
>
> Dropping into the outer region moves the con beside the target. If the
> move direction goes against the orientation of the parent container, the
> con moves out of the row.
- Fix crash: Ignore containers without a managed window (eg i3bar)

1 files changed, 1 insertions, 0 deletions

diff --git a/meson.build b/meson.build
index df2d86e0..5c6a6198 100644
--- a/meson.build
+++ b/meson.build
@@ -409,6 +409,7 @@ i3srcs = [
   'src/sighandler.c',
   'src/startup.c',
   'src/sync.c',
+  'src/tiling_drag.c',
   'src/tree.c',
   'src/util.c',
   'src/version.c',