tmux: Add a 'resize mode' similar to my i3 config

Add a 'resize mode' that behaves similar to the one in my i3 config.
When pressing the binding `<prefix>r`, a new key-table is selected that
allows resizing with `hjkl` as well as choosing the different layouts
directly over the number row.

.config/tmux/tmux.conf

@@ -76,23 +76,24 @@ bind h selectp -L
 bind j selectp -D
 bind k selectp -U
 bind l selectp -R
-# Resize panes with Alt-Shift-[hjkl]
+
-bind -n M-H resizep -L
+# Resize mode similar to my i3 config
-bind -n M-J resizep -D
+bind -T resize h resizep -L \; switchc -T resize
-bind -n M-K resizep -U
+bind -T resize j resizep -D \; switchc -T resize
-bind -n M-L resizep -R
+bind -T resize k resizep -U \; switchc -T resize
+bind -T resize l resizep -R \; switchc -T resize
+bind -T resize 1 selectl even-horizontal \; switchc -T resize
+bind -T resize 2 selectl even-vertical   \; switchc -T resize
+bind -T resize 3 selectl main-horizontal \; switchc -T resize
+bind -T resize 4 selectl main-vertical   \; switchc -T resize
+bind -T resize 5 selectl tiled           \; switchc -T resize
+bind r switchc -T resize
 
 # Allow C-h to still be passed (when programs expect it as backspace, e.g. UEFI
 # shell)
 bind -r -T selfinsert C-h send C-h
 bind C-v switchc -T selfinsert
 
-# Resize panes with Alt-Shift-<arrow>
-bind -n M-S-Left resizep -L
-bind -n M-S-Up resizep -D
-bind -n M-S-Down resizep -U
-bind -n M-S-Right resizep -R
-
 # Synchronize the panes in the current window with `<prefix>S`
 bind S set -w synchronize-panes