Jeremypw/fix cancel folder creation (#1454)

Author: jeremypw

data/code.metainfo.xml.in

@@ -89,6 +89,7 @@
         <issue url="https://github.com/elementary/code/issues/1416">Code hangs when choosing active project when two project starting with the same string are loaded</issue>
         <issue url="https://github.com/elementary/code/issues/1418">Duplicated items in "Find In Project Popover"</issue>
         <issue url="https://github.com/elementary/code/issues/1429">Extensions dialogue MUST be resizable</issue>
+        <issue url="https://github.com/elementary/code/issues/1436">Cancelling new folder creation in project causes parent folder to disappear from sidebar</issue>
         <issue url="https://github.com/elementary/code/issues/570">Draw Spaces On Current Line</issue>
         <issue url="https://github.com/elementary/code/issues/574">git branch not readable if dir name is too long</issue>
         <issue url="https://github.com/elementary/code/pull/1446">Fix "go to line" behaviour when column number is not explicitly set</issue>

src/FolderManager/FolderItem.vala

@@ -252,8 +252,8 @@ namespace Scratch.FolderManager {
 
             view.ignore_next_select = true;
             ((Code.Widgets.SourceList.ExpandableItem)this).remove (item);
-            // Add back dummy if empty unless we are removing a rename item
-            if (!(item is RenameItem || has_dummy || n_children > 0)) {
+            // Add back dummy if empty
+            if (!(has_dummy || n_children > 0)) {
                 ((Code.Widgets.SourceList.ExpandableItem)this).add (dummy);
                 has_dummy = true;
             }

src/Utils.vala

@@ -172,8 +172,12 @@ namespace Scratch.Utils {
             return false;
         }
 
+        var content_type = info.get_content_type ();
         if (info.get_file_type () == FileType.REGULAR &&
-            ContentType.is_a (info.get_content_type (), "text/*")) {
+            ContentType.is_a (content_type, "text/*") ||
+            ContentType.is_a (content_type, "application/x-zerosize")
+            ) {
+
             return true;
         }