'Open File' missing from img diff

[jrieken]

• have a image in git
• make a modification to it
• the image-editor shows 'Open Changes'
• open the diff editor for that image
• 🐛 the editor still shows 'Open Changes' and not 'Open File'

[mjbvz]

Note that this also happens with binary files that don't use custom editors

[bpasero]

This can be explained easily: all commands in Git check for the isInDiffEditor context key which only exists for text diff editor. To fix this properly we need an new key such as isSideBySideEditor whenever the SideBySideEditor is active.

Could probably be done similar to the TextCompareEditorActiveContext key we have for text diff editors.