Bug 158586

Summary: Web Inspector: difficult to zoom rendering frames timeline using trackpad
Product: WebKit Reporter: Blaze Burg <bburg>
Component: Web InspectorAssignee: Nobody <webkit-unassigned>
Status: NEW ---    
Severity: Normal CC: inspector-bugzilla-changes, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: All   
OS: All   
Attachments:
Description Flags
[MOVIE] jumpy zooming none

Description Blaze Burg 2016-06-09 14:39:04 PDT
Created attachment 280952 [details]
[MOVIE] jumpy zooming

It should be centered at where the mouse cursor is, but it drifts to the right or left if you are slightly off center. See the video.

I think we need to add or increase the hysteresis to be more up/down left/right than the record-based timelines. This is because those timelines give much faster feedback so you can adjust your trackpad movement easier. By comparison the rendering frames timeline is jumpy.
Comment 1 Radar WebKit Bug Importer 2016-06-09 14:41:10 PDT
<rdar://problem/26728126>
Comment 2 Timothy Hatcher 2016-06-09 16:34:56 PDT
I think we have a similar bug with normal timeline zooming getting off from the mouse.