this ports https://github.com/Electron-Cash/Electron-Cash/pull/1371
including commits:
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bab816e2c3
Buttons Editor: Make background non-transparent and change to push button
There were some issues with transparent backgrounds with QToolButton on
Linux and as there is no real reason for them to be transparent we just
make them opaque.
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2cb698affc
Pay to editor: Fix size computations to use the proper values
Previously this did not take into account the spacing between lines nor
the margins of the control and the document. There is also a sensible
minimum height of one line now and it expands to up to 10 lines before
we show the scroll bar. When the scroll bar is active, we move the buttons
so they do not obscure the scroll bar.
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1b7a70f4f5
Pay to editor: Increase height by one if cursor is under buttons
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abd42d9f66
Buttons Editor: Always center if the document is just one line high
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33bd0b82e0
Pay to editor: Make button movement on scrollbar change reliable
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94f8476c2e
Pay to editor: Use document lineCount instead of height
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5bedfce392
Buttons Editor: Improve vertical centering of the buttons, needs to take into account the frame width
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0cd0b490c4
Buttons Editor: Add transparent border which is somehow needed for correct macOS layout
01d20cba49