LyX 2.4.0-beta2; zoom slider

[Andrew Parsloe]

I've downloaded and installed LyX 2.4.0-beta2 on a windows 10 machine, 
replacing 2.4.0 alpha3. (I haven't seen an announcement for beta2. I had 
to go searching for it.) No problems installing and after a week's use 
only one niggle (see below), no big issues (e.g. preview works well) and 
there are a number of appreciated visible enhancements over alpha3, e.g. 
around icons and status bar.

The niggle: the zoom slider on the status bar is a trap for the unwary. 
Given a new toy of course one wants to play with it, slide it, click the 
little + and - buttons and see what the effect is and then try to get 
the zoom to a nice round number -- 200 in my case, and definitely not 
198 or 203 etc. The trouble is that each adjustment of zoom level 
triggers a recalculation of instant previews. I had a number of long 
documents open, two of them with a multitude of previews each. My 
fiddling soon had the cpu racing at 100% and LyX stalling as thousands 
of previews were being generated. Perhaps there needs to be a wait time 
after the last slider adjustment before preview generation is triggered? 
The urge to get a round number like 150 or 200 is strong, almost 
compulsive, but fiddly with the slider requiring multiple attempts.

Andrew


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