Review Request 125773: Fix units.gridSize and theme.mSize for some fonts

[Sebastian Kügler]

> On Nov. 2, 2015, 12:05 p.m., Sebastian Kügler wrote:
> > I don't like this change, as it introduces a magic constant for a value that we completely control our own. (Well, to the degree that we say "a gridUnit is roughly the height of a line of text". The 1.6 constant looks weird here, and I'm against adding font specific hacks in, especially since at that point in the code, we don't even know what the font is.
> > 
> > This is not a structural solution, so -1.
> 
> David Rosca wrote:
>     I understand, but what is a structural solution?
>     The font metric is clearly wrong for Noto, Oxygen (and certainly some other fonts) and this change is backwards compatible with current code.
>     
>     And this is not a font specific hack, this just scales the actual height of M to the expected gridUnit value because gridUnit never was a height of M character (it is like 1.6 * height of M = thus the magic number).

Well, problems arise as soon as you change the font -- the computation is not based on the default font, but on the currently selected font. The funny thing here is that the Oxygen font is actually the wrong one, as that includes more height than the rendered character, but also some spacing above.

What is the exact issue you see? I'm still not quite clear on that.

The bug you're referring to should be fixed by not computing the font manually, but use units.iconSizes.* instead. (I haven't tried, but that's the semantically correct solution.)


- Sebastian


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On Oct. 29, 2015, 6:16 p.m., David Rosca wrote:
> 
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> This is an automatically generated e-mail. To reply, visit:
> https://git.reviewboard.kde.org/r/125773/
> -----------------------------------------------------------
> 
> (Updated Oct. 29, 2015, 6:16 p.m.)
> 
> 
> Review request for Plasma.
> 
> 
> Bugs: 343349
>     http://bugs.kde.org/show_bug.cgi?id=343349
> 
> 
> Repository: plasma-framework
> 
> 
> Description
> -------
> 
> For some fonts, QFontMetrics::boundingRect(QString) returns too high rect which makes the gridSize too big.
> It now returns correctly the actual height of M character. For backwards compatibility, the value is multiplied with 1.6.
> 
> This affects eg. Noto Sans font that is now default for Plasma 5.5.
> 
> 
> Diffs
> -----
> 
>   src/declarativeimports/core/units.h fa2256e 
>   src/declarativeimports/core/units.cpp 4e2adae 
>   src/plasma/theme.cpp c49ad4c 
> 
> Diff: https://git.reviewboard.kde.org/r/125773/diff/
> 
> 
> Testing
> -------
> 
> When switching to Noto Sans font, I noticed that icons in system tray grow to big size so it switched to 1 column in vertical panel. Basically everything in Plasma grow too much (even though the font is visually the same or even smaller than DejaVu Sans that I was using before - same font size 9 was used) - too big spacing in task manager, too big popups (application menu, system tray popups), etc ...
> 
> This fixes the issue. This may also fix BUG 343349
> 
> 
> File Attachments
> ----------------
> 
> systray + popup before
>   https://git.reviewboard.kde.org/media/uploaded/files/2015/10/29/d409b391-e35e-451f-bb5b-aa42e7eb2bf3__before.png
> after
>   https://git.reviewboard.kde.org/media/uploaded/files/2015/10/29/445009bc-a4a8-4998-8e82-996a0a4e33fb__after.png
> 
> 
> Thanks,
> 
> David Rosca
> 
>

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