Hoist _getCurrentLinkId() in print() loop

Avoid calling _getCurrentLinkId() twice per codepoint when a hyperlink
is active by reading the link id once before the print loop.

Fixes #5940

Co-authored-by: Daniel Imms <Tyriar@users.noreply.github.com>

src/common/InputHandler.ts

@@ -531,6 +531,8 @@ export class InputHandler extends Disposable implements IInputHandler {
       return;
     }
 
+    const linkId = this._getCurrentLinkId();
+
     this._dirtyRowTracker.markDirty(this._activeBuffer.y);
 
     // handle wide chars: reset start_cell-1 if we would overwrite the second cell of a wide char
@@ -567,8 +569,8 @@ export class InputHandler extends Disposable implements IInputHandler {
       if (screenReaderMode) {
         this._onA11yChar.fire(stringFromCodePoint(code));
       }
-      if (this._getCurrentLinkId()) {
-        this._oscLinkService.addLineToLink(this._getCurrentLinkId(), this._activeBuffer.ybase + this._activeBuffer.y);
+      if (linkId) {
+        this._oscLinkService.addLineToLink(linkId, this._activeBuffer.ybase + this._activeBuffer.y);
       }
 
       // goto next line if ch would overflow