Cursor drift on long lines

[gtritchie]

Describe the bug

The cursor drifts off the correct position with very long lines of text. Hitting enter to break the line ends up breaking it in a different location than it appeared it would.

Expected Behavior

The cursor's visual location should be accurate even on super-long lines.

Current Behavior

Paste the long line of text from "repro steps" below into Kitchen sink. Scroll to the end, then click after the comma as indicated here:

Hit enter, line breaks a couple characters to the right of where cursor appeared to be:

Reproduction Steps

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Possible Solution

Don't use such long lines?

Additional Information/Context

No response

Ace Version / Browser / OS / Keyboard layout

Kitchen Sink, latest Chrome on Windows

[kevinushey]

I wonder if it would help to bump up the number of characters used when measuring the character width here?

ace/src/layer/font_metrics.js

Line 8 in 099011b

var CHAR_COUNT = 512;

The issue also likely depends on the font size, since that seems to impact the precision of the computed character width. (I don't see an issue with a font size of 12px, but the issue is more apparent with a font size of 11px or 10px.)

[akoreman]

Hey, thanks for raising this issue, we tried to fix what seems to be the same issue in #4996 but had to revert that in #5052 because it was causing other issues (#5012).