Visual Shader - sometimes can't click preview when not zoomed at 100%

[mangecoeur]

Godot version:
3.3RC6

OS/device including version:
macOS 11.2.3, intel macbook pro 15 (2017)

Issue description:
When working on a visual shader, if I try to click the preview icon when I am zoomed out (i.e. not at 100%), it instead tries to create a new node (see screen recording)

Steps to reproduce:
Create a visual shader node, zoom out, then try to click the shader preview icon.

visual_shader_preview_bug.mp4

[akien-mga]

This might be fixed in master already and if so would likely be fixed by #47173 - it's a bit late in the 3.3 development cycle to merge it now though, but it will probably make its way to 3.3.1. (Still needs confirmation that it's indeed the same issue.)

[Chaosus]

I noticed that #46441 fixes only port connections but not a preview button, I wanna try to fix this too.