I am expecting to see the new and more buttons.
I see black new and more buttons, and then after a few seconds they become invisible.
This is a bug, just open the client and it happens. It seems that it happens only for the buttons with the drop-down menus.
When you open it, it looks like this:

Then after a few seconds like this:

This is the output in the terminal:

@ipkpjersi It may be related to your video driver, not HeidiSQL
As a workaround try to run Heidi in WindowsXP mode: type winecfg in the terminal
You may also try wine staging https://wine-staging.com/installation.html
Your comment helped me a lot, thank you. I don't think it's my GPU drivers since NVIDIA has some pretty great propetiary drivers for Linux. Wine staging did not help. I found out that running in Windows XP mode DOES help, and I never knew about winecfg, only winetricks. It turns out I can make it so that my wine system level is Windows 10 and this specific application is Windows XP. I must admit that I am a bit perplexed why anything newer than XP/2003 results in this bug, but it does narrow it down and you did provide me with a suitable solution for my use case. Thanks again for the help.
This is probably still this issue in GNU Gettext for Delphi: https://sourceforge.net/p/dxgettext/bugs/80/
Hm, the above mentioned issue was not a _Wine_ issue but mainly on Windows, but it sounds so similar...

My just committed change may or may not help here. Please test the next build on Wine.
I'm unsure how to build it and likely don't have the time but if you can send me an EXE of it I can test it out.
The builds are automatically created via script on heidisql.com - so the exe is already there - please download from https://www.heidisql.com/download.php#nightlybuilds . Or, if that works, click Help > "Check for updates" in HeidiSQL, after connecting to some server.
Yup, that fixed it. Nice job! I will now close this issue.
Cool
Most helpful comment
@ipkpjersi It may be related to your video driver, not HeidiSQL
As a workaround try to run Heidi in WindowsXP mode: type winecfg in the terminal
You may also try wine staging https://wine-staging.com/installation.html