remove some redundant rebuildLayout() calls

Thomas Holderrequested to merge
speleo3/inkscape:less-rebuildLayout into master

@Tavmjong as far as I can tell, these calls to rebuildLayout() and updateRepr() are redundant. E.g. typing one character currently triggers 4 calls to rebuildLayout() - with this patch it's only one. Typing, resizing, moving, and copy/pasting text all seems to behave correct.

I can't reproduce LP Bug 1339305.

Edited by Jonathan Neuhauser

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