[Webkit-unassigned] [Bug 140193] New: Web Inspector: Cursor & scroll view jump when editing in style sidebar for the first time

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=140193

            Bug ID: 140193
           Summary: Web Inspector: Cursor & scroll view jump when editing
                    in style sidebar for the first time
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Inspector
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bugzilla at roguewhaler.net
                CC: graouts at webkit.org, joepeck at webkit.org,
                    jonowells at apple.com, mattbaker at apple.com,
                    nvasilyev at apple.com, timothy at apple.com,
                    webkit-bug-importer at group.apple.com

Screen recording of this issue in WebKit r178028: http://roguewhaler.net/files/web-inspector-jumping.mov

When editing in the style sidebar for the first time after opening an Inspector, several things may happen:
- The cursor may jump to the beginning of the line.
- The scroll view may jump so that the line being edited is at the top.
- Characters typed may be skipped.

The linked video shows the first two issues occurring. The above may occur when typing or when clicking the checkbox next to a style declaration. Subsequent edits behave correctly.

As far as I can tell, my symptoms are the same as reported in #137467. (However, that bug report mentioned ensuring the Inspector is docked — I can reproduce this issue reliably regardless of whether the Inspector is docked, bottom or right, or in a separate window.)

I can reproduce this consistently in Safari 8.0.2 (10600.2.5) and WebKit r178028, both on OS X 10.10.1 (14B25).

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