Recently a contact on an old project of mine contacted me to ask why they could not create a file called GeoMap.js in WebIDE.
To verify this I created a new SAPUI5 Application and tried to create a file called GeoMap.js
and lo and behold they were correct, you cannot create the file…
Strange, ignoring the errors will eventually show the file added in the Workspace but you cannot open it.
After a bit of Googling it became clear that the EasyList adblocking list blocks all URL paths which contain geomap.js.
Disable your Adblocker on WebIDE or setup a whitelist rule to disable the easylist rule (I think!) and then you will be able to create and use the file.
This may also happen on other files as well.
Thanks to Rudi @ TheNextView.nl for finding this little gotcha!