Icons are too small when title bars and menus are scaled by 1.75

[Tony Houghton]

I've just installed Ubuntu 14.10 on a Macbook Pro Retina 13. I tried setting the menu and title bar scaling to 1.75 but the icons did not scale up appropriately; they stayed at a factor of 1 AFAICT. Certain apps, eg Nautilus and the settings app, seemed to be using the icon size to determine layout, so the text appeared cramped and some was truncated. I increased the setting to 2 and then the icons did scale up (but not the pointer, see #1359211). However, now title bars, menus and other text-based widgets are larger than ideal. I can reduce the font sizes with unity-tweak-tool but it doesn't seem to affect the title bar size etc.

I presume the lack of icon scaling is because GTK only supports integer scaling settings and Unity is rounding down the setting for it. Please could it be changed to round up for fractions over 0.5.

ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: unity 7.3.1+14.10.20141016-0ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-31.43-generic 3.16.7-ckt5
Uname: Linux 3.16.0-31-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.14.7-0ubuntu8.2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CurrentDesktop: Unity
Date: Thu Mar 19 20:51:27 2015
InstallationDate: Installed on 2015-03-19 (0 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Steve Kevin (gjzh666-gr)]

Same here, scale 1.38x is way larger than 1.75x; it happened after the unity package is updated to unity 7.4.5+16.04.20171201.3