Document editor screen jumping full fix #4850
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amovsisyan's patch looks for an anchor to save the position relative to. Which works fine as long as there are anchors on every page. Unfortunately with tables this often is not the case. If GetDocumentPositionByXY() returns an anchor on a previous, invisible page, try moving down the current page 10 pixels at a time until we find an anchor on this page. This is similar to what the code above does. If that does not work either, we need to reference an anchor on a previous page. Use ConvertCoordsToAnotherPage() to do this correctly.
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When we get an update, we set ViewPosition. This will in theory be used to position the next rendered frame via CheckTargetUpdate(). However it can be some time before CheckViewPosition() actually gets as far as scrolling to the saved position, because of recalculations. So we need to check whether there has been any scrolling since we saved ViewPosition. This adds an additional bit of state, savedTopOffset, which is the top cursor position of the top page at the time of generating ViewPosition. Probably it should be on one of the State/ViewPosition Anchor values.
Store it in the correct state object rather than as a property directly on the Document. This is more consistent and should avoid any bugs with e.g. state saving on undo.
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This fixes the jumping bug for me (bug 3054: ONLYOFFICE/DocumentServer#3054 ) and is an extension on #4848 .
Note that this includes the patch from @amovsisyan. You will need them to sign the CLA as well as me. Unfortunately they changed the email address they commit with.