bug#37359: [PATCH] Fix ignored Motif scrollbar resources.

[Matt Bisson]

Hi Emacs maintainers,

I noticed that I was only able to set the "truck" color for scrollbars on 
Motif.  I tried a variety of methods, including explicitly setting resources 
for the scrollbar class as documented by the libXm API, and using foreground 
and background faces, but to no avail.  After looking at the code in 
src/xterm.c, I noticed that the creation code was not quite correct, so I 
patched the code (attached):

On Motif scrollbars, "foreground" has no meaning, while "background" means the 
truck and arrow colors, and "trough" means the background of the entire widget. 
 I have hooked up the Emacs scrollbar "foreground" color to the XmNbackground 
resource, and the "background" color to XmNtroughColor.  This is more in line 
with how Xaw scrollbars behave.

I am still a little flummoxed as to why the more sweeping resource settings 
like "*XmScrollBar*troughColor" seem to have no effect, but that's an issue for 
another day, and I may look into it further as I have time.

My Emacs environment is 26.3 (but I noticed this code has been like this a long 
time) running on 64-bit Linux (Gentoo).  The Motif version is 2.3.8.

Thanks,
-Matt

0001-Fix-ignored-Motif-scrollbar-resources.patch
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