[New-bugs-announce] [issue37559] IDLE: Scrolling issues with code context shown

[Tal Einat]

New submission from Tal Einat <taleinat at gmail.com>:

With code context shown, scrolling a window by dragging the scrollbar causes the scrollbar's tab to "jump around" and sometimes some "flashing" visual artifacts.

The "flashing" appears to occur only before the screen is resized for the first time, in which case the entire window is resized whenever the number of context lines changes during scrolling.

See attached animated screen capture.

Reproduced on latest versions of Win10 and macOS.

See also PR GH-14030, adding line numbers, which makes this more likely to occur for users.

----------
assignee: terry.reedy
components: IDLE
files: code-context-scolling-compressed.gif
messages: 347666
nosy: cheryl.sabella, taleinat, terry.reedy
priority: normal
severity: normal
status: open
title: IDLE: Scrolling issues with code context shown
versions: Python 3.7, Python 3.8, Python 3.9
Added file: https://bugs.python.org/file48469/code-context-scolling-compressed.gif

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37559>
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