Shortcut to show change diff
Answered
There are shortcuts to move between changes in current open file
Moving scrolls to changed lines and opens popup with diff and actions
How to access this popup while cursor is already on changed line?
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Look for the Change under caret action in the Keymap
How about making Ctrl-Alt-Shift-. the default shortcut for this?
Makes sense, I think: up = Previous, . = current, down = next
Better assign current to some closer key like Ctrl-Alt-Shift-Numpad 0
Or move all to numpad because Ctrl-Alt-Shift-Right/Left Arrows already on moving action, e.g. Alt + Previous = Numpad 8 (Up arrow), Current = Numpad 5 and Next is Numpad 2 (Down arrow)
It is not possible to provide default shortcuts for all actions - that is why they are configurable in the keymap.
Anyway, you are welcome to submit a request to https://youtrack.jetbrains.com/issues/IDEA