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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - View scale changes are temporarily lost after restoring a page from the page cache"
href="https://bugs.webkit.org/show_bug.cgi?id=144934">144934</a>
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<th>Summary</th>
<td>View scale changes are temporarily lost after restoring a page from the page cache
</td>
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<th>Classification</th>
<td>Unclassified
</td>
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<th>Product</th>
<td>WebKit
</td>
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<th>Version</th>
<td>528+ (Nightly build)
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<th>Hardware</th>
<td>Unspecified
</td>
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<th>OS</th>
<td>Unspecified
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
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<th>Component</th>
<td>WebKit2
</td>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
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</tr>
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<th>Reporter</th>
<td>thorton@apple.com
</td>
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<pre>Steps to Reproduce (through the code!):
1. Set a non-1 viewScale.
2. Navigate.
3. Set a different non-1 viewScale.
4. Go back.
Expected:
WebCore's pageScaleFactor should be equal to the viewScale set in #3.
The transform on the tiles should be a scale equal to the viewScale set in #3.
Actual:
WebCore's pageScaleFactor is equal to the viewScale set in #1.
The transform on the tiles is a scale equal to the viewScale set in #1.
Notes:
This is happening because the pageScaleFactor stored on HistoryItem is WebCore's pageScaleFactor, which has
the viewScale multiplied into it. When we come back from the PageCache, HistoryController does a setPageScaleFactor() with
the stored scale (with the old viewScale multiplied into it), disregarding any viewScale changes since that item went into the PageCache.
Since WebKit2 keeps pageScale and viewScale separately, doing a small pinch zoom will push the correct pageScaleFactor to WebCore and recover from this situation.
To fix this, I think we're going to have to inform WebCore of the viewScale, something I had previously been trying to avoid -- but only for the purposes of the PageCache, so hopefully it will be OK.</pre>
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