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In dev build when error ("Unable to resolve identifier ...") icon is showing (red question) I can't set breakpoint
I see the same behavior in Java debugger as well. Reassigning to debuggercore.
Breakpoint cannot be set by clicking on gutter because there is an error annotation which consumes the mouse click and performs its own action. However, it is still possible to toggle a line breakpoint by Ctrl+F8, so I do not think this is a serious problem. A possible solution could be to distinguish between a mouse click on annotation's icon and a space on the gutter positioned left to the icon (this still could invoke the default action and set a breakpoint). Or to set breakpoints by double clicks? Reassigning to editor for evaluation.
Already reported, thank you. *** This issue has been marked as a duplicate of 105746 ***