Consolidate updating of various Toolbar state (e.g. page and scale) in one method in PDFViewerApplication
#7457
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…n one method in `PDFViewerApplication` With the changes in PR 7289, we no longer dispatch a 'pagechanging' event on load. Since most PDF documents open on the first page, this means that the `previous` and `firstPage` buttons are no longer correctly disabled. To avoid this, this patch moves the code that updates various UI toolbar state into one method, which is then called on document initialization and from the various existing event handling functions.
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With the changes in PR #7289, we no longer dispatch a 'pagechanging' event on load. Since most PDF documents open on the first page, this means that the
previousandfirstPagebuttons are no longer correctly disabled.To avoid this, this patch moves the code that updates various UI toolbar state into one method, which is then called on document initialization and from the various existing event handling functions.
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