Ensure the SQL editor has enough space to show block folding arrows in the gutter.

web/pgadmin/tools/sqleditor/static/css/sqleditor.css

@@ -155,9 +155,13 @@
   cursor: pointer;
 }
 
-.CodeMirror, #editor-panel .CodeMirror-gutters {
-    min-height: 100%;
-    height: 100%;
+.CodeMirror {
+  min-height: 100%;
+  height: 100%;
+}
+
+#editor-panel .CodeMirror-gutter {
+  min-width: 1em;
 }
 
 #output-panel {