Overview of changes in 3.21.90
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* Experimental sharing support (751181)

* Bugs fixed:
 760839 Improvements to the size guessing API
 763156 Allow discarding all edits
 770157 Split ItemManager to have a separate child manager for each mode

* Updated translations:
 Czech
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 French
 Friulian
 German
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 Hungarian
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 Indonesian
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 Slovak
 Spanish