Only press enter if not focused after click, fixing highlight tests

Pressing enter when not needed was leading to test failures due
to extra new lines getting added

Author: krassowski

atest/_resources/Keywords.resource

@@ -343,7 +343,8 @@ Enter Cell Editor
     Click Element    css:.jp-Cell:nth-child(${cell_nr}) .cm-line:nth-child(${line})
     # So it should be focused after click right? Well, not when using this driver
     # in JupyterLab 4.1 - we still need to press enter apparently.
-    Press Keys    None    ENTER
+    ${focused}    Get Element Count    css:.jp-Cell:nth-child(${cell_nr}) .cm-focused
+    Run Keyword If    ${focused} == 0    Press Keys    None    ENTER
     Wait Until Page Contains Element    css:.jp-Cell:nth-child(${cell_nr}) .cm-focused
     # clicking on line does not appear sufficient in CM6 (but still useful because it ensures we have it in view
     Execute JavaScript