Change mouse pointer to "waiting" while opening documents #1111
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Relates to #1109
When loading large documents there may be a significant moment of
seeming inactivity. This commit changes the mouse pointer to "wait"
during that time.
NOTE: This only works when opening a document into the first tab.
Obviously some code inside AbstractDocument.load() must take
care of this (i.e. returning only when the document is fully loaded).
Therefore this pull request should not be merged yet.
@fedelibre please test this both with large original files and in conjunction with file import.