Ctrl+Shift+Insert in Eclipse key bindings doesn't show insert caret when monitor zoom ≠ 100%

[arunjose696]

Description
Mirror ticket for eclipse-platform/eclipse.platform.ui#3010

[HeikoKlare]

Before working on this, note that there already is a fix proposal that we can process:

• Fix caret of raw insert mode of text editor on HiDPI screens eclipse-platform/eclipse.platform.ui#3230