With Greybird (and all other Shimmer themes), can't grab Pale Moon scrollbar at far right edge

[qwertyblahblah]

With the default MX Linux theme of Greybird I'm not able to grab the Pale Moon web browser scrollbar when I move the mouse cursor to the very right edge. The cursor misses the scrollbar. This is a big deal. When you're scrolling down a web page you don't want to have to carefully line up the mouse cursor on the scrollbar to move down a page, you want to be able to shove it all the way to the right at the side of your vision without having to focus.

I tested Greybird on Mint and had the same issue, while no such issue with Mint's default Mint-X theme. In fact I can't pick up the scrollbar at the far right edge in Pale Moon with most themes shipped with MX: Greybird, Albatross, Bluebird, High Contrast, Mediterranean, Raleigh, Shearwater, Zukitwo. I CAN pick up the scrollbar at the far right edge in Pale Moon with these themes: Mint-X, Adwaita, Kiwi, Murrina, Nox, XFCE. With Greybird you can grab the scrollbar at the far right in Firefox, so this is an issue only with how these themes play on Pale Moon. I'll add the scrollbar size or position doesn't seem to be what causes the issue. The Albatross scrollbar for one is really thick and extends all the way to the right but I can't grab it, while the scrollbar with the Mint-X theme is slim and leaves a good mm to the right.

Other Pale Moon users confirmed this issue... https://forum.palemoon.org/viewtopic.php?f=37&t=15710&sid=abf736e6debb964939fce2b2183c3217

Greybird and the other Shimmer themes are pretty nice and I'd like to be able to use them but I won't as long as this issue persists. Grabbing the scrollbar at the far right edge of a browser is essential use behaviour.

Pale Moon is a great browser, originally a fork of Firefox, and with its continued improvement and Firefox's continued user interface mishaps, reduced customisability, and recent decision to move from xul add-ons to web extensions and thereby disabling most current add-ons we should expect Pale Moon to gain more and more usage. So I hope you can consider how your themes play with it a serious enough issue. Thanks.

[alexxcons]

As well a problem in thunar and mousepad. Here the related reports:
https://bugzilla.xfce.org/show_bug.cgi?id=16050
https://bugzilla.xfce.org/show_bug.cgi?id=16056
https://bugzilla.xfce.org/show_bug.cgi?id=16048

[andreldm]

@alexxcons I can reproduce this problem with Mousepad and Thunar 1.8.9 using Adwaita, so it doesn't seem to be a Greybird defect. However like @codebrainz mentioned at geany/geany#2361 Greybird could ship a workaround to prevent this problem.