default-config: Bind Mod+M to maximize-window-to-edges

resources/default-config.kdl

@@ -558,6 +558,12 @@ binds {
     Mod+F { maximize-column; }
     Mod+Shift+F { fullscreen-window; }
 
+    // While maximize-column leaves gaps and borders around the window,
+    // maximize-window-to-edges doesn't: the window expands to the edges of the screen.
+    // This bind corresponds to normal window maximizing,
+    // e.g. by double-clicking on the titlebar.
+    Mod+M { maximize-window-to-edges; }
+
     // Expand the focused column to space not taken up by other fully visible columns.
     // Makes the column "fill the rest of the space".
     Mod+Ctrl+F { expand-column-to-available-width; }