Log Message:
poppler: updated to 21.04.0

Release 21.04.0:
core:
* Hide symbols by default
* TextSelectionDumper: fix word order for RTL text
* Fix rendering of text in some files.
* Implement rendering of Masks of Image subtype.
* Forms: fix unclicking standalone form buttons.

glib:
* Expose more fields from MediaRendition in PopplerMedia
* Use stock glib macro to define boxed type
* Remove incorrecly used volatile from enum type registration code

qt5:
* Fix crash in files with malformed signatures
* Fix memory leak when QImage constructor "fails"

qt6:
* Fix crash in files with malformed signatures
* Fix memory leak when QImage constructor "fails"

utils:
* pdfsig: New paragraph for "-sign" in manpage
* pdfimages: Do not assert in "too big images".

build system:
* Require cmake >= 3.10
* Require Qt 5 >= 5.9
* Require glib >= 2.56
* Require gtk 3 >= 3.22
* Require gdk-pixbuf >= 2.36

Release 21.03.0:
core:
* Fix parsing text in some broken pdf files.
* Fix memory issue when using threads.
* TextSelectionDumper: Fix getText() for space after word
* Change signature of OutputDev:tilingPatternFill
* Make PDFDocBuilder return a std::unique_ptr
* Improve well formed check for shading functions
* Fix leak in case of fread failing
* Fix memory leak in broken file in JBIG2Stream::readGenericBitmap
* PSOutputDev: Fix stack overflow in broken files

glib:
* poppler_annot_free_text_get_callout_line: Fix wrong static cast
* poppler-structure-element: fix memleak
* Improve documentation
* demo: keep same visual appearance between displayed and copied text

utils:
* pdftotext: Add -cropbox option
* pdftoppm: Add -progress option
* pdftoppm: Fix rounding bug in computation of output bitmap size.

qt6:
* Add missing poppler-qt6.pc.cmake

Release 21.02.0:
core:
* GfxCal*ColorSpace: introduce Bradford transform for chromatic adaptation
* Fix memory leak if saving the file fails
* Internal code improvements
* Fix various issues handling broken files
* Make checkedAdd work for long long in MSVC

qt5:
* Properly export NewSignatureData class
* Fix regression in QIODeviceOutStream + MSVC

qt6:
* Properly export NewSignatureData class
* Fix regression in QIODeviceOutStream + MSVC

utils:
* pdftohtml: Fix error() parameter type