Bug 266250

Summary:

Custom Highlights API painting does not invalidate properly when removing highlights

Product:

WebKit

Reporter:

manuelroth

Component:

New Bugs

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Major

CC:

a_protyasha, bramus, megan_gardner, ntim, webkit-bug-importer

Priority:

Keywords:

InRadar

Version:

Safari 17

Hardware:

Mac (Apple Silicon)

OS:

macOS 14

Attachments:

Description	Flags
Bug with custom highlights api	none
Screenshot of bug reproduced on iOS 17.2	none

manuelroth

Reported 2023-12-11 13:26:48 PST

Created attachment 468987 [details] Bug with custom highlights api ## Steps to reproduce: - Open codepen on Safari on macOS 14.2: https://codepen.io/jensimmons/pen/vYbvrjq - Enter the word "features" into the text field - Make sure the word was entered character by character (not by copy pasting the entire word) - Observe how single "f" characters are highlighted instead of only the word "feature" - Other words ## Expected result: Only the word "features" is highlighted ## Actual result: Many single characters "f" in addition to the word "features" is highlighted This behaviour can also be reproduced with other words such as constantly, twice, typical. This issue can only be reproduced on desktop Safari and not on iOS

Attachments
Bug with custom highlights api (239.00 KB, image/png) 2023-12-11 13:26 PST, manuelroth	no flags	Details
Screenshot of bug reproduced on iOS 17.2 (428.29 KB, image/png) 2023-12-11 14:03 PST, manuelroth	no flags	Details
View All Add attachment proposed patch, testcase, etc.

manuelroth

Comment 1 2023-12-11 14:02:39 PST

I first stated that this issue can only be reproduced on Safari on macOS. This is not true. I am also able to reproduce the is issue on iOS 17.2

manuelroth

Comment 2 2023-12-11 14:03:27 PST

Created attachment 468989 [details] Screenshot of bug reproduced on iOS 17.2

Abrar Rahman Protyasha

Comment 3 2023-12-11 14:18:38 PST

Thanks for the bug report! Yes, I would be surprised if it could only be reproduced on MacOS.

Tim Nguyen (:ntim)

Comment 4 2023-12-11 19:48:25 PST

I can reproduce this. We don't invalidate properly the painting in this case. Seems like a bug.

Radar WebKit Bug Importer

Comment 5 2023-12-11 19:48:35 PST

<rdar://problem/119531671>

Tim Nguyen (:ntim)

Comment 6 2023-12-11 19:50:17 PST

I think this is a painting invalidation bug, because selecting the paragraph (which triggers a repaint), will fix this issue.

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