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While using xmobar to reproduce/fix a bug in xmonad I noticed that
xmobar doesn't react immediately to the signals to reposition or change
screen.
Apparently none of the Xlib functions called from `repositionWin` flush
the Xlib output buffer (XMoveResizeWindow is known to not flush,
although it's unfortunately not documented), so when compiled with the
threaded runtime that runs XNextEvent in a separate thread, the
reposition is sent to the X server only later when other stuff happens.
With all monitors set to refresh once a minute, this can take a looong
time.
(It's entirely possible this happens even without the threaded runtime,
I didn't test that, sorry.)
The fix is to call XSync at the end of `repositionWin`.
While at it, I spotted that drawInWin calls XSync with discard=true,
which seems like a mistake. We don't want to discard any events, do we?
(In practice, I'd expect the `eventer` thread to read all events even
before the drawing thread manages to discard them, so even if this
discarding XSync ever had any reason to be there, I don't think it does
anything meaningful these days. I may be wrong, though.)
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This fixes the following crash that happens with the default xmobar
configuration (using HOME=/ makes xmobar ignore ~/.xmobarrc):
$ echo "<fn=1>x</fn>" | HOME=/ xmobar
xmobar: Prelude.!!: index too large
Commit 3e9e1cb9d300 ("Fix crashes/busy looping happening via index")
meant to fix this but apparently it only fixed indexing of fontlist, not
voffs, so the crash was still there.
Fixes: https://github.com/jaor/xmobar/issues/504
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The readme says additional fonts are centered vertically if a
corresponding offset isn't specified in `textOffsets`, but this didn't
happen as we used the first font's metrics for centering of all fonts
instead.
Fixes: a2365debfaba ("New configuration parameter `textOffsets` (fixes #311)")
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ColorInfo contains background offsets, it is no longer only about colors
TextRenderInfo can hold information such as color, offsets, etc
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Implemented only for XFT fonts.
Adds a new "part" in the fc tag.
> Example: <fc=white,gray:0>foo bar</fc> will make the font background
as tall as the bar (absolute offset, here set to 0 for both top &
bottom)
Changes ColorString to ColorInfo, containing both top and bottom
offsets. The "colors string" is still in only one string.
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Right now, with the `StdinReader` plugin enabled - you can crash/cause
busy looping of xmobar if the following html file is opened:
```
<html>
<head>
<title>hello <fn=1>string</fn> </title>
</head>
</html>
```
More details about this bug is here:
https://github.com/jaor/xmobar/issues/442#issuecomment-625706001
This MR also fixes another bug which produces a crash in xmobar if you
pass non integer items between fn:
<fn=crash>
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src/Xmobar/X11/Draw.hs:51:11-12: warning: [-Wunused-matches]
Defined but not used: ‘wr’
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51 | drawInWin wr@(Rectangle _ _ wid ht) ~[left,center,right] = do
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src/Xmobar/App/EventLoop.hs:50:1-36: warning: [-Wunused-imports]
The import of ‘Xmobar.X11.Events’ is redundant
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50 | import Xmobar.X11.Events(nextEvent')
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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