fix(qt): improve GUI responsiveness for huge wallets

[UdjinM6]

Issue being fixed or feature implemented

Somehow a 500k+ txes wallet is MUCH more responsive with this patch. I'm not sure if it's macos only or not though, pls test.

What was done?

How Has This Been Tested?

Run a wallet with 100k+ txes in it and send a tx or try changing units.

Breaking Changes

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated relevant unit/integration/functional/e2e tests
• I have made corresponding changes to the documentation
• I have assigned this pull request to a milestone (for repository code-owners and collaborators only)

[knst]

@UdjinM6 is everything right with columns width for you?

maybe unrelated bug on develop, but I just noticed it.

UPD: I found a reason, not sure how to fix it, but that's unrelated to this PR. My fonts in system is setup to resolution 144 dpi, it causes this bug. As I tested, 90dpi and 120dpi are completely fine. If I set 144 or 160 dpi - it doesn't fit any UI elements anymore.

[knst]

ACK a4378fc

it works much faster for faucet wallet when new transaction is coming or if change in settings 'amount' format

[UdjinM6]

@UdjinM6 is everything right with columns width for you?

maybe unrelated bug on develop, but I just noticed it.

I don't have this issue on macOS. What OS are you using?

... if change in settings 'amount' format

You can change it without going into setting btw, can simply click unit name in the bottom left corner.

[PastaPastaPasta]

utACK a4378fc

I did use it, didn't strictly notice any massive gains, but was focusing more on the testing I was doing at the time, I think I noticed improvements, but no regressions noticed