simplify media manager panel height #3935
Merged
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The height of the panel was calculated in JavaScript, trying to use the remaining space. With larger headers that lead to a relatively small area. In addition the height calculation behaved weirdly on certain resolutions (in some templates) resulting in a decreasing height on each image interaction.
This patch simply sets the panel height 60% of the browser window using the vh unit (which was not available when the media manager was written).
To keep backward compatibility and not accidentally break a bunch of templates, the height is still set from JavaScript but only once instead of updating it on every resize operation.
A proper refactoring of the whole media manager code is still something we need to tackle in the future, but this change should make it slightly better.