Add set-column-width action

resources/default-config.kdl

@@ -173,6 +173,17 @@ binds {
     Mod+F { maximize-column; }
     Mod+Shift+F { fullscreen-window; }
 
+    // Finer width adjustments.
+    // This command can also:
+    // * set width in pixels: "1000"
+    // * adjust width in pixels: "-5" or "+5"
+    // * set width as a percentage of screen width: "25%"
+    // * adjust width as a percentage of screen width: "-10%" or "+10%"
+    // Pixel sizes use logical, or scaled, pixels. I.e. on an output with scale 2.0,
+    // set-column-width "100" will make the column occupy 200 physical screen pixels.
+    Mod+Minus { set-column-width "-10%"; }
+    Mod+Equal { set-column-width "+10%"; }
+
     Print { screenshot; }
     Mod+Shift+E { quit; }