cairo: Make sure we always push a transparency group in setSoftMaskFromImageMask()

Because that's what unsetSoftMaskFromImageMask() assumes.

https://bugs.freedesktop.org/show_bug.cgi?id=81624
cairo: Make sure we always push a transparency group in setSoftMaskFromImageMask()

Because that's what unsetSoftMaskFromImageMask() assumes.

https://bugs.freedesktop.org/show_bug.cgi?id=81624
annots: Fix a crash when adding annot without contents

Having no content in an annotation results in a crash when generating
its appearance, since the contents pointer is dereferenced.
For consistency, the same has been done in Annot::initialize.
glib: Return NULL in poppler_annot_get_contents also for empty strings
annots: Fix a crash when adding annot without contents

Having no content in an annotation results in a crash when generating
its appearance, since the contents pointer is dereferenced.
For consistency, the same has been done in Annot::initialize.
glib: Return NULL in poppler_annot_get_contents also for empty strings
glib: Fix a memory leak when getting text layout and attributes
glib: Fix a memory leak when getting text layout and attributes
pdfseparate: additonal handling for annotations

Bug #77549
Don't check for inlineImg twice

Bug #82059
Improve non-latin characters in inline notes

Preview commit had by mistake changes in these two files that belong here

Bug #65956
Merge remote-tracking branch 'origin/poppler-0.26'
glib-demo: Remove use of deprecated gtk_dialog_get_action_area()

https://bugs.freedesktop.org/show_bug.cgi?id=82385
glib-demo: Replace use of deprecated gtk stock items

https://bugs.freedesktop.org/show_bug.cgi?id=82384
Makefile.am cleanups

Bug #79411
poppler: use poppler-data pkg-config for both cmake and autotools builds