Overall very nice.

Instead of symlinking input-mouse to dialog-input-devices, I think it might make more sense to rename dialog-input-devices to be input-mouse and then change the dialog-input-devices so that it depicts more than one input device, to reinforce its name. Maybe a mouse + keyboard?

While you're thinking about input device icons, we also have a few outstanding bugs:

• The colorful version of the mouse icon is hard to see on a dark background, and also it maybe should have a more generic appearance rather than looking like a Razer mouse: https://bugs.kde.org/show_bug.cgi?id=406453
• We need a joystick icon that actually looks like a joystick: https://bugs.kde.org/show_bug.cgi?id=406679

In D20708#453690, @ngraham wrote:

Overall very nice.

Instead of symlinking input-mouse to dialog-input-devices, I think it might make more sense to rename dialog-input-devices to be input-mouse and then change the dialog-input-devices so that it depicts more than one input device, to reinforce its name. Maybe a mouse + keyboard?

I don't think I can fit a whole keyboard, but I can probably fit a numpad.

While you're thinking about input device icons, we also have a few outstanding bugs:

• The colorful version of the mouse icon is hard to see on a dark background, and also it maybe should have a more generic appearance rather than looking like a Razer mouse: https://bugs.kde.org/show_bug.cgi?id=406453

That will be a lot of work and I don't want to do that in this diff since it'll slow the rest of the changes down considerably. The most important change in this diff is that this is fixed (22px icon where 16px should be):

• We need a joystick icon that actually looks like a joystick: https://bugs.kde.org/show_bug.cgi?id=406679

I'll do that with the 64px mouse icon fix when I get around to it.

Actually, dialog-input-devices is used by inkscape for configuring pointing devices and tablets. AFAIK, only Inkscape uses that icon. If I made it show more types of devices, it would be more accurate to use a tablet. Looking at the Input Devices dock in Inkscape, it doesn't seem like it would be used much for configuring mice, so it might be better if it was just a symlink to the input-tablet icon.

These are the hicolor icons Inkscape uses for that icon:

Even if only Inkscape currently uses the icon, as a rule we ignore that kind of information for code/content in Frameworks, because in principle any app could use it. It's more important for the icon to be semantically correct for any app that wants to use it than it is for it to match its current sole user.

For dialog-input-devices, I would accept an icon that includes a drawing tablet, but not one that has only a drawing tablet.

We can do the Mouse and Joystick changes in another patch, I just wanted to mention them. :)

In D20708#454298, @ngraham wrote:

Even if only Inkscape currently uses the icon, as a rule we ignore that kind of information for code/content in Frameworks, because in principle any app could use it. It's more important for the icon to be semantically correct for any app that wants to use it than it is for it to match its current sole user.

For dialog-input-devices, I would accept an icon that includes a drawing tablet, but not one that has only a drawing tablet.

How is this? 16px

I tried making the mouse bigger, but it didn't work out very well since there was never quite enough room to make it feel balanced.

I think that looks good!