Mark pinned tabs as pinned

[yafp]

Right now (using 0.4.0 and the light theme) i can't really see if a tab is pinned or not.

I guess it might be useful to use some kind of non-disturbing small element / ui-change to have a clear difference between normal tabs & pinned tabs.

Ideas:
a) display a pin-icon instead of the the close icon on pinned tabs
b) use a small left border similar to the active-tab but with a light color which isn't that eye-catchy

[Croydon]

Small progress on this issue with v0.5.0: Dark&Light themes are having now a blue left border for pinned tabs.

[yafp]

Just installed 0.5.0 - the blue left border on pinned tabs in the light theme is helpful ...Thanks.

[yafp]

To be honest - the current blue border is perfect for me - i don't see a need for more. Feel free to close the issue if you feel similar ;)

[Croydon]

I leave the issue open till I have a visual highlighting for all themes. Right now it is just for the Dark&Light theme. Also there is an issue that sometimes the close button is displayed on pinned tabs.

[Croydon]

All themes have with v0.6.1+ a blue left border for pinned tabs.

[Croydon]

The close button should be always hidden on pinned tabs starting with v0.7.0. 7ce08b2

[Croydon]

Still missing: Pinned tabs should always be visible. That is the most important aspect of pinned tabs and it is getting lost currently.

[Croydon]

Only thing left: pin icons.

[bmerry]

I'm not sure if this belongs in this bug or elsewhere, but I would like to see pinned tabs as just a row of favicons, similar to Tree Style Tab.

[Croydon]

@bmerry That is part of #135.