Bugs in version 20.5.0-alpha.2

[stephanrauh]

• [x] you can't print after closing a PDF viewer and opening a new one
• [x] The "highlight all" toggles of the highlight tool has gone lost
• [x] unverified signature aren't drawn

[stephanrauh]

Version 20.5.0-alpha.3 fixes these bugs.

[stephanrauh]

Another bug:

• [x] Clicking the +/- zoom buttons triggers two zoom events
• [x] viewer-4.3.654.mjs:12766 #renderAnnotationLayer: "TypeError: window.getFormValueFromAngular is not a function"when toggling between the form demo and the infinite scroll demo
• [x] http://localhost:4200/extended-pdf-viewer/filtering-console-log only works on initial load, but not after showing a different demo
• [x] http://localhost:4200/extended-pdf-viewer/custom-thumbnails is broken after showing a different demo: TypeError: window.updateThumbnailSelection is not a function at CustomThumbnailsComponent.onThumbnailDrawn

[stephanrauh]

The bug fixes have landed with version 20.5.0.