Description

With MacOS .geojson files will be identified as "application/geo+json" type. So the current code will not look for it in MIME_LOOKUP list.

How to reproduce

• use a mac os system
• go into one map
• click the import button(import a map file or vector data) from sidebar menu in the right side of the page
• select one .geojson file to import

Expected Result
a modal which can configure the style for this geojson data should appear.

Current Result
file not supported message showed

Other useful information