Full screen mode doesn't use all the pixels of a Macbook Air 13" on OS X 10.9.5. The gap is ~5 pixels. Doesn't seem to be limited to any specific application. See screenshot at https://cloudup.com/cD5KSG8Zgwc
Is your Dock hidden on the left? OS X reserves that space if it is.
Oh yes! 4 pixels for the dock. Case closed.
Why is it "case closed"? Other apps will remove this gap nomather where the dock is. I started a thread on /r/osx cause I thought is was a OSX specific bug, but it is Spectacle.
Of course Spectacle could work around this behavior (introducing an offset if Spectacle can determine which edge the Dock resides) but it feels wrong. The reason the gap exists is because moving the mouse within that gap causes a hidden Dock to appear. It would be personally annoying to constantly attempt to interact with content within that gap. Imagine if you wanted to manually resize the height of the window? You would need to constantly deal with the Dock reappearing.
But that is where you have spectacle for right? Changing the width, heigh and position of the window. Personally I have downloaded Spectacle to stop managing the height and the with of the window manually.
It's just an example but my point is the same. Apple explicitly introduces the gap when the Dock is hidden for a reason. I don't think it's worth assuming they were wrong and blindly working against the decision for all Spectacle users, or even adding a hidden preference to do the same.
Back to the 'the position of the dock to the bottom' for me than. Its really annoying if you try to have the dock at one of the sides.
The gap is pretty annoying. I have dual monitors, and the only reason I have the dock on the left side is to ensure that the Command+Tab prompt is shown on that same screen (as it follows the dock).
It would be nice to have the option to disable the gap. If it's something you would accept a PR for I would be happy to investigate, if you could point me in the right direction.
Can be added an option in spectacle to ignore this 5 pixels?
Any word on this? Issue #555 and author @twlz0ne has a dirty fix for it.
@eczarny: I have created radars for every version of Mac OS X and macOS since 2009, and every time, Apple just closed it saying they have no plans on "fixing it".
Until "hide menubar automatically" was introduced in El Capitan (I think it was), I thought there might be a good reason for this gap being there, although I was sure that the problem could be solved some other way. Since they introduced the feature of auto-hiding the menubar, I have been dumbfounded that they won't fix this problem and remove the gap from the dock. It makes no sense the gap is needed for the Dock but not the menubar.
Since that is the case, I think that spectacle should add an option to ignore the gap.
_UPDATE_
I discovered you can get Moom to ignore the gap (if the dock is pinned to left or right) by running defaults write com.manytricks.Moom "Ignore Dock" -bool YES, so even though I like Spectacle better than Moom, I have paid for a Moom license and will be using it until the day the Spectacle is able to ignore the gap.
I can't understand the design from Apple, dislike gap :(
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Can be added an option in spectacle to ignore this 5 pixels?