I am using the latest 2.0 release of Textmate on a 2017 Macbook Pro. MacOS 10.14.6
I have experienced this only twice in the last two days. Both times, I had three open documents in Textmate and with the project drawer visible.
I clicked in the Tab bar to select a different document. And the program becomes unresponsive. I cannot type any characters and clicking on any part of the editor view in Textmate has no effect.
Clicking on Tabs has not effect Clicking in the File Browser has no effect. Interestingly, dragging a Tab to the desktop will make a copy of the Document on the desktop.
Clicking on the "Menus" at the bottom of the window such as Tabs, or Language, or the GoTo menu will show the menu. Clicking on an item in the Goto Menu does not move the editor that that location.
If I switch to another app I cannot use Cmd-Tab to bring TextMate to the front. The TextMate icons is visible when I press Cmd-Tab but selecting it has not effect. I can bring TextMate to the front by clicking on it.
Activity Monitor shows that TextMate is not using any CPU.
I have to Force Quit TextMate.