tree ec29c4d4387b621d26c6e61b8dd3bff77d384956
parent c855284df51cb4c9ccc37955d6185616708ea6da
author luoe <luoe@chromium.org> 1493232460 -0700
committer Commit bot <commit-bot@chromium.org> 1493232460 +0000

DevTools: avoid slowdown from unnecessary DOM, style mutations on CodeMirrorTextEditor

Logging console messages that generate decorations (wavy underline under errors)
will cause a slowdown. UISourceCodeFrame's _updateDecorations() can remove and
re-add the same decoration or CSS class from a line, even if it did not change.

This CL avoids removing a decoration/class if the new one is the same.

BUG=651610

Review-Url: https://codereview.chromium.org/2820253002
Cr-Original-Commit-Position: refs/heads/master@{#467394}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: f677ae05d0b2e54b4876b3921a0dc1b9d66b4a21