Scintilla treats mouse modifiers as a group. When Alt is used for rectangular selection and Shift for extending a selection, Alt+Shift+Click will create or extend a rectangular selection from the current caret to the click. Scintilla's default mapping scheme uses Extend=Shift; Rectangular=Alt; Multiple=Ctrl. Where possible, the same modifier scheme is used for keyboard commands.

There could be an API to completely specify the logical from physical mouse modifier mapping: [Extend=Shift|Ctrl|Alt|Super|Nothing|...;Rectangular=...;Multiple=...] while retaining combinations. This should reject ambiguous definitions like assigning both Extend and Rectangular to the Alt key. Difficulties here include defining the set of modifiers as they differ between platforms.

While Scintilla does some processing of right mouse button and middle mouse button clicks, these don't use modifiers except for right clicks in the margin which may be forwarded to the app with a specific notification. Thus, it would be fairly simple to assign goto-definition to Ctrl+RightClick or similar chord,

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