X-Git-Url: https://git.lyx.org/gitweb/?a=blobdiff_plain;f=src%2Flyxcursor.h;h=8c78d9f5d463e1be81a3994486ed913cf13c08bd;hb=0ba59ef037642f4de07669128355fac762b04746;hp=7e21d4e2c4571529c10ab140a50a142e6a930d40;hpb=7c98b3bd37f41ad05e9770d66774f999fbd17ff8;p=lyx.git

diff --git a/src/lyxcursor.h b/src/lyxcursor.h
index 7e21d4e2c4..8c78d9f5d4 100644
--- a/src/lyxcursor.h
+++ b/src/lyxcursor.h
@@ -103,7 +103,21 @@ private:
 	Paragraph * par_;
 	/// The position inside the paragraph
 	lyx::pos_type pos_;
-	/// FIXME
+	/**
+	 * When the cursor position is i, is the cursor is after the i-th char
+	 * or before the i+1-th char ? Normally, these two interpretations are
+	 * equivalent, except when the fonts of the i-th and i+1-th char
+	 * differ.
+	 * We use boundary_ to distinguish between the two options:
+	 * If boundary_=true, then the cursor is after the i-th char
+	 * and if boundary_=false, then the cursor is before the i+1-th char.
+	 *
+	 * We currently use the boundary only when the language direction of
+	 * the i-th char is different than the one of the i+1-th char.
+	 * In this case it is important to distinguish between the two
+	 * cursor interpretations, in order to give a reasonable behavior to
+	 * the user.
+	 */
 	bool boundary_;
 	/// the pixel x position
 	int x_;