Mod1+b/^Left and Mod1+f/^Right

Reported by Jochen Sprickerhof, thanks! Applied patch with minor change (only initialize `i` for XINERAMA).

in this context XftColor is a too low-level type.

this makes it slightly easier to add colors to schemes.

WM_CLASS is a standard ICCCM property which is used to identify windows. Window managers and compositors use it to allow per-application configurable behavior.

This reverts commit 09d0a36e0370f7ca9bdb171bf93c5ac3131c5a92. Using strncmp with the length of the user input turns it into a prefix match rather than an exact match as it's supposed to be.

thanks Markus Teich and David!

for example: dmenu -m '-9001'

This reverts commit a4053bc4e403ae57343f43b7e363a0911bba5a3a. My bad, was working on the wrong branch and accidently pushed it... *facepalm*

When the input text fully matches a single item, do not draw the item and highlight the input text to show that it matches an item in opposition to regular input text not matching anything.

Without this, we discard the item if it's longer than assigned width instead of truncating it.

- extract drawitem function (code deduplication) - fix bug where inputw was not correctly calculated from the widest item, but just from the one with the longest strlen() which is not the same. It's better now, but does not account for fallback fonts, since it would be too slow to calculate all the correct item widths on startup. - minor code style fixes (indentation, useless line breaks)

This prevents accessing to a potentially out-of-bounds memory section. Signed-off-by: Lucas Gabriel Vuotto <l.vuotto92@gmail.com>