The default keystrokes for xfce4-terminal Search/Find is "<Primary><Shift>f" or Ctrl + Shift + f (Shift Ctrl f). This keystroke combination conflicts with the keystroke combination for entering Unicode characters of Ctrl + Shift + u + <hex> [hex ...]. Example: To input the Unicode ⛽ U+26FD character in xfce4-terminal, one has to input Ctrl + Shift + u + 2 + 6 + f + d. xfce4-terminal will display the Search/Find dialog box after the "f" key is pressed. Workaround: 1) Remove the semicolon before the line ";(gtk_accel_path "<Actions>/terminal-window/search" "<Primary><Shift>f")" in the ~/.config/xfce4/terminal/accels.scm file. 2) Replace the "f" with another letter; I use "g." 3) Open a new xfce4-terminal window to test. Ctrl+Shift+<your choice> should show a Find dialog. Recommendation: Select another default keystroke combination.
xfce4-terminal version: 0.6.3 The drop-down did not have this version.
After pressing Ctrl+Shift+u you should be able to release the Ctrl and Shift modifiers. Type the digits 2 6 f d without modifiers, and then press space or enter (or escape to cancel).
Ah. Release the keys after "u." Works as you say. I found a guide on the web and that's how I learned the combination. Thank you. No bug here.
Although I find the supported way more convenient, it seems that holding down the modifiers is a standard way to type, see https://www.cl.cam.ac.uk/~mgk25/volatile/ISO-14755.pdf Besides f, a,c and d conflict with existing shortcuts, too P.S. firefox can handle this even if it has conflicting shortcut Ctrl+Shift+a; it blocks the shortcut key, if you are in the middle of writing unicode code.
> it seems that holding down the modifiers is a standard way to type That's a 23 year old document, from the Windows 95 and FVWM era. I personally wouldn't count on a 23 year old document, no matter how "standard" it is, telling how a user interface (input method) should work.
The reviewed standard seems not to be free (if it ever changed): https://www.iso.org/standard/25491.html Found the link from https://en.wikipedia.org/wiki/ISO/IEC_14755
https://en.wikipedia.org/wiki/Help:Entering_special_characters#Linux_-_Unicode tells GTK supports only the method mentioned in comment 2.