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reworked Label class

Rafał Mikrut requested to merge github/fork/leezh/label-valign-fix into master

Created by: leezh

  • no longer inherits Range - instead, more sensible function names controlling lines visible
  • more accurate vertical alignment
  • percent_visible preserved even after setting new text

Largely motivated by the frustratingly inaccurate vertical alignment, particularly with large fonts. Before: https://gfycat.com/WaterySimpleHornedtoad After: https://gfycat.com/NeighboringMetallicKilldeer

The code for controlling the lines visible was already there, but I changed it so that instead of using set_val() and set_max() you now use set_lines_skipped() and set_max_lines_visible().

Also, percent_visible and visible_chars are now recalculated properly each time you use set_text() because that could change the total length, and when you use set_visible_characters().

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