Allow workspace contents to be moved if there are only floating children

include/con.h

@@ -39,6 +39,12 @@ bool con_is_leaf(Con *con);
  */
 bool con_is_split(Con *con);
 
+/**
+ * Returns true if this node has regular or floating children.
+ *
+ */
+bool con_has_children(Con *con);
+
 /**
  * Returns true if this node accepts a window (if the node swallows windows,
  * it might already have swallowed enough and cannot hold any more).

src/commands.c

@@ -402,7 +402,7 @@ void cmd_move_con_to_workspace(I3_CMD, char *which) {
      *  when criteria wasn't specified and we don't have any window focused. */
     if ((!match_is_empty(current_match) && TAILQ_EMPTY(&owindows)) ||
         (match_is_empty(current_match) && focused->type == CT_WORKSPACE &&
-        con_is_leaf(focused))) {
+        !con_has_children(focused))) {
         ysuccess(false);
         return;
     }
@@ -491,7 +491,7 @@ void cmd_move_con_to_workspace_name(I3_CMD, char *name) {
         return;
     }
     else if (match_is_empty(current_match) && focused->type == CT_WORKSPACE &&
-        con_is_leaf(focused)) {
+        !con_has_children(focused)) {
         ysuccess(false);
         return;
     }
@@ -526,7 +526,7 @@ void cmd_move_con_to_workspace_number(I3_CMD, char *which) {
      *  when criteria wasn't specified and we don't have any window focused. */
     if ((!match_is_empty(current_match) && TAILQ_EMPTY(&owindows)) ||
         (match_is_empty(current_match) && focused->type == CT_WORKSPACE &&
-        con_is_leaf(focused))) {
+        !con_has_children(focused))) {
         ysuccess(false);
         return;
     }

src/con.c

@@ -232,6 +232,14 @@ bool con_is_leaf(Con *con) {
     return TAILQ_EMPTY(&(con->nodes_head));
 }
 
+/**
+ * Returns true if this node has regular or floating children.
+ *
+ */
+bool con_has_children(Con *con) {
+    return (!con_is_leaf(con) || !TAILQ_EMPTY(&(con->floating_head)));
+}
+
 /*
  * Returns true if a container should be considered split.
  *
@@ -643,18 +651,22 @@ void con_move_to_workspace(Con *con, Con *workspace, bool fix_coordinates, bool
     }
 
     if (con->type == CT_WORKSPACE) {
-        con = workspace_encapsulate(con);
-        if (con == NULL) {
-            ELOG("Workspace failed to move its contents into a container!\n");
-            return;
-        }
-
         /* Re-parent all of the old workspace's floating windows. */
         Con *child;
         while (!TAILQ_EMPTY(&(source_ws->floating_head))) {
             child = TAILQ_FIRST(&(source_ws->floating_head));
             con_move_to_workspace(child, workspace, true, true);
         }
+
+        /* If there are no non-floating children, ignore the workspace. */
+        if (con_is_leaf(con))
+            return;
+
+        con = workspace_encapsulate(con);
+        if (con == NULL) {
+            ELOG("Workspace failed to move its contents into a container!\n");
+            return;
+        }
     }
 
     /* Save the current workspace. So we can call workspace_show() by the end

testcases/t/132-move-workspace.t

@@ -318,4 +318,23 @@ $ws = get_ws($tmp2);
 is_num_children($tmp2, 1, 'one container on second workspace');
 is(@{$ws->{floating_nodes}}, 2, 'two floating nodes on second workspace');
 
+###################################################################
+# same as the above, but with only floating children
+###################################################################
+$tmp2 = get_unused_workspace();
+$tmp = fresh_workspace();
+cmd 'open';
+cmd 'floating toggle';
+
+$ws = get_ws($tmp);
+is_num_children($tmp, 0, 'no regular nodes on first workspace');
+is(@{$ws->{floating_nodes}}, 1, 'one floating node on first workspace');
+
+cmd 'focus parent';
+cmd "move workspace $tmp2";
+
+$ws = get_ws($tmp2);
+is_num_children($tmp2, 0, 'no regular nodes on second workspace');
+is(@{$ws->{floating_nodes}}, 1, 'one floating node on second workspace');
+
 done_testing;