Show "Dash preview" when holding down Super for a while
Feature summary
Thank you for your fantastic work!
I really like how in Gnome you can press Super+[number] to open the corresponding application you have pinned on your dash.
I think this could be further improved by having the dash appear automatically in place (like a "Dash preview", in the same place as it is in the Overview, but on top of whatever else you have on screen), with the numbers shown on top of the applications icons, if you hold down the Super-key without doing anything else for more than X seconds.
Like the numbers shown on the icons in Slack if you hold down Ctrl+Shift for a while (see screenshots below).
Because if you do that, at least I would think that it is because you've forgotten what place the app you want is in. Since you normally use this Super + number feature without seeing the Dash in front of you you might forget in the moment. So you hold Super, fully intending to press a number to open an app, but the correct order escapes you. So you just keep holding it, trying to remember. Then it would be helpful for the preview to show up.
I think the best thing to happen of you let go of Super after those X seconds would be to just hide this "Dash preview" (or whatever you'd call it), and nothing else. Today the Overview is shown when you let go of the Super-key without pressing anything else, no matter how long you've held it for. This seems unnecessary – no one would hold Super for a long time just because they want to do the same thing as pressing it would do – and maybe a tiny bit of a security/privacy risk. Because if you keep holding Super down without doing anything else that might be because you where about to open Overview but then someone walked in on you that you don't want to see your overview. You could press Esc to dismiss, but then you have to know and remember that.
How would you like it to work
Think I've explained everything above. Please ask if anythings unclear.
Relevant links, screenshots, screencasts etc.
Slack normally:
Slack when holding down Ctrl+Shift for a few seconds: