Some icons use RTL unicode characters and can mess up surrounding text

Some icons switch the active direction of text to RTL and affect the surrounding text. Specific examples are the latex icon (extension .tex) and the SVG icon. I know there are others as well, but #46 is a result of this issue specifically for the latex icon.

I don't have a PR yet (I could produce one if desired), but I was able to completely resolve these issues in my config by overriding the offending icons to add LTR Unicode direction isolates around the icon text. The Unicode consortium introduced these isolates to specifically help with issues like this. Text inside the isolate markers cannot affect the direction of the surrounding text, and as long as the terminal emulator properly supports the Unicode bidi algorithm, using the isolates fixes many of the rendering issues.

I've verified that if the icon text is surrounded with LTR isolate markers (LRI .. icon .. PDI), then the icons will no longer mess up the rendering of surrounding text if the terminal emulator properly applies the bidi algorithm (modern terminal emulators do). Isolates specifically do not affect the direction of the surrounding text so this won't affect rendering if the icon appears in RTL text.

Maybe the icons that use codepoints that are designated as RTL (Tex, SVG, etc) should have LTR isolate markers around the unicode codepoint. This would involve something like:

["tex"] = {
    icon = "<U+2066>ﭨ<U+2069>", -- actual utf-8 encoded codepoints instead, this is for demonstration
    color = "#3D6117",
    name = "Tex"
  };
...

I have this override in my config and it corrected rendering issues with telescope.nvim and fzf-lua when they rendered the tex icon in their popup windows.

Another possibility is changing the get_icon() function to wrap the icon text in the isolate markers before returning, possibly with a memoization.

Start by inspecting the icon definitions and the get_icon() entry point, focusing on the tex and SVG icons. Reproduce the issue in Telescope.nvim or fzf-lua popup windows, then verify that affected icons no longer alter surrounding text direction while remaining usable in RTL text.