Implement title alignment

This adds support for `i3 4.16`'s ability to set the title alignment.
The command is `title_align left|center|right`.

When the title is on the right, marks are moved to the left. Otherwise,
they are on the right.

1 files changed, 7 insertions, 0 deletions

diff --git a/include/sway/config.h b/include/sway/config.h
index a6920835..1ff9a104 100644
--- a/include/sway/config.h
+++ b/include/sway/config.h
@@ -357,6 +357,12 @@ enum mouse_warping_mode {
         WARP_CONTAINER
 };
 
+enum alignment {
+        ALIGN_LEFT,
+        ALIGN_CENTER,
+        ALIGN_RIGHT
+};
+
 /**
  * The configuration struct. The result of loading a config file.
  */
@@ -409,6 +415,7 @@ struct sway_config {
         bool validating;
         bool auto_back_and_forth;
         bool show_marks;
+        enum alignment title_align;
         bool tiling_drag;
 
         bool smart_gaps;