Minimum size for Dashboard container does not encompass the Input Control buttons

[marius-dr]

Kibana version: 6.1.0

Browser version: IE11, Chrome 61 and Firefox 57

Original install method (e.g. download page, yum, from source, etc.): BC1

Description of the problem including expected versus actual behavior:
When editing the container sizes for a viz that is displayed on a dashboard, the minimum size constraint doesn't keep track of the buttons that are part of the Input Controls viz.
On IE and Chrome it shows the container dotted line above the buttons, where the slider ends, while on Firefox the dotted line remains under the buttons, but the corner edit button for the container size gets put above the buttons.

Chrome:

Firefox:

IE:

This allows you to overlap other visualizations on top of the Input Control buttons.

[nreese]

caused by #13982

[marius-dr]

Looks to be happening in PhantomJS reports as well.

[bhavyarm]

Need to ensure that input control in iFrames look good. Right now the alignment is messed up :
Chrome:

safari: