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Summary: Adjust calculation of icon pixmap Y value; now based off center of text label bounding rectangle. Previously, icons appeared top-aligned when text size was larger than icon size. Centering is done by obtaining the center point of the text frame (`m_textRect.center().y()`) and setting the top `Y` point of the icon to one-half of the scaled icon height (`m_scaled_PixmapSize.height()`) Division is done by `2.0`, to ensure calculations are done with floating-point math, in keeping with `QPointF`, which returns floating-point values. Also includes an adjustment named `midlineShift` (contributed by @zzag), which takes into account the font's midline in respect to the center of the text frame. Certain fonts (i.e. Noto Sans) can have a slightly offset midline, resulting in imperfect alignment of the icon. This small adjustment resolves that potential issue. See before and after screenshots. {F5764918} Before, showing misalignment (with and without debugging wireframes) {F5764920} After, showing correction BUG: 390771 Test Plan: -- Compile Dolphin with patch -- Increase system font size by several points (i.e. 15pt) -- Check that Places panel icons remain centered with the text label -- Select Compact View mode -- Adjust icon size slider to minimum -- Ensure that icons also remain centered in file listing -- Check several combinations of icon size & font size to ensure centering is consistent Reviewers: #dolphin, ngraham, cfeck, elvisangelaccio Reviewed By: #dolphin, ngraham, elvisangelaccio Subscribers: zzag, elvisangelaccio, #dolphin Differential Revision: https://phabricator.kde.org/D11650e0f7fe87
