When saving or exporting choose the file type / extension automatically based on the one typed with the file name
Since 90% of the time, you need to rename or edit a title. It would be a time saver if you could name as well select the correct format directly from the "save as" selection name field. ex: You type image1.png, Then the "format" would automatically change itself to the correct "PNG" format (so you don't need to do that as well). Of course, this would be on all.
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I should add that adding '.png' is 'Save As' dialog specifically should do nothing like this, since 'PNG' is not a valid file type when saving, and belongs to 'Export As' dialog.
'Saving' implies a user can 'open' the file back and get the same level of editability. 'Exporting' is... well, 'transfiguration', like vector art into raster art.