cmd_floating: Support `enable` and `disable` commands too.

This is especially relevant in combination with `for_window`, e.g.:
`for_window [title="Terminal"] floating enable`.

sway.5.txt

@@ -38,8 +38,8 @@ Commands
 **exit**::
 	Exit sway and end your Wayland session.
 
-**floating** toggle::
-	Toggles the "floating" status of the focused view.
+**floating** <enable|disable|toggle>::
+	Make focused view floating, non-floating, or the opposite of what it is now.
 
 **floating_modifier** <modifier>::
 	When the _modifier_ key is held down, you may use left click to drag floating

sway/commands.c

@@ -306,15 +306,26 @@ static struct cmd_results *cmd_floating(int argc, char **argv) {
 	if ((error = checkarg(argc, "floating", EXPECTED_EQUAL_TO, 1))) {
 		return error;
 	}
-
-	if (strcasecmp(argv[0], "toggle") == 0) {
 	swayc_t *view = get_focused_container(&root_container);
+	bool wants_floating;
+	if (strcasecmp(argv[0], "enable") == 0) {
+		wants_floating = true;
+	} else if (strcasecmp(argv[0], "disable") == 0) {
+		wants_floating = false;
+	} else if (strcasecmp(argv[0], "toggle") == 0) {
+		wants_floating = !view->is_floating;
+	} else {
+		return cmd_results_new(CMD_FAILURE, "floating",
+			"Expected 'floating <enable|disable|toggle>");
+	}
+
 	// Prevent running floating commands on things like workspaces
 	if (view->type != C_VIEW) {
 		return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 	}
+
 	// Change from nonfloating to floating
-		if (!view->is_floating) {
+	if (!view->is_floating && wants_floating) {
 		// Remove view from its current location
 		destroy_container(remove_child(view));
 
@@ -329,7 +340,8 @@ static struct cmd_results *cmd_floating(int argc, char **argv) {
 			view->height = view->desired_height;
 		}
 		arrange_windows(swayc_active_workspace(), -1, -1);
-		} else {
+
+	} else if (view->is_floating && !wants_floating) {
 		// Delete the view from the floating list and unset its is_floating flag
 		// Using length-1 as the index is safe because the view must be the currently
 		// focused floating output
@@ -359,7 +371,6 @@ static struct cmd_results *cmd_floating(int argc, char **argv) {
 		remove_view_from_scratchpad(view);
 	}
 	set_focused_container(view);
-	}
 	return cmd_results_new(CMD_SUCCESS, NULL, NULL);
 }