debugger console not executing manually input expressions
Answered
It has become impossible to evaluate manually input expressions in the debugger console all of a sudden: hitting Enter results in line breaks all the way down (see attached an attempt to execute 1+1 hitting Enter three times).

Executing expressions from editor or manual input in the 'standard' (not debugger) console works.
EDIT: this problem only occurs when the console is in 'floating' mode, not in 'dock pinned' mode.
Would appreciate any help!
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Let's try removing the .idea folder of that project (it contains project-specific settings) and then reopening the project in PyCharm. Has it helped?
‘removing the .idea folder’ doesn't work.
Does the issue reproduce in that project but with a new virtualenv?
Another twist: the console works fine in the docked pinned mode, not in the floating mode:
based on suggested above: removing .idea doesn't help; the problem persists in another virtualenv
Ahh, I see. Indeed, the issue reproduces when the window is in Float mode.
I filed a bug to our issue tracker about that https://youtrack.jetbrains.com/issue/PY-49590, please vote for it and feel free to comment.