Fix terminal resizing when new postion of last modeline overlap top row of last window.

display.c

@@ -1327,6 +1327,12 @@ static void sizesignal( int signr) {
 static void newscreensize( int h, int w) {
 	chg_width = chg_height = 0 ;
 	vtfree() ;
+	if( h < 3)
+		h = 3 ;
+
+	if( w < 10)
+		w = 10 ;
+
 	vtalloc( h, w) ;
 	if( h <= term.t_mrow)
 		newsize( TRUE, h) ;

names.c

@@ -50,7 +50,7 @@ const name_bind names[] = {
 	{"!case-word-lower", lowerword,					META | 'L'} ,
 	{"!case-word-upper", upperword,					META | 'U'} ,
 	{" change-file-name", filename,					CTLX | 'N'} ,
-	{" change-screen-size", newsize,				META | CTL_ | 'D'} , /* M^S */
+	{" change-screen-size", (fnp_t) newsize,		META | CTL_ | 'D'} , /* M^S */
 	{" change-screen-width", (fnp_t) newwidth,		META | CTL_ | 'T'} ,
 	{" clear-and-redraw", (fnp_t) redraw,			CTL_ | 'L'} ,
 	{" clear-message-line", (fnp_t) clrmes, 		0} ,

window.c

@@ -566,11 +566,8 @@ BINDABLE( restwnd) {
  * int f;	default flag
  * int n;	numeric argument
  */
-BINDABLE( newsize) {
+BBINDABLE( newsize) {
 	window_p wp ;		/* current window being examined */
-	window_p nextwp;	/* next window to scan */
-	window_p lastwp;	/* last window scanned */
-	int lastline;		/* screen line of last line of current window */
 
 	/* if the command defaults, assume the largest */
 	if( f == FALSE)
@@ -581,32 +578,33 @@ BINDABLE( newsize) {
 		return mloutfail( "%%Screen size out of range") ;
 
 	if( term.t_nrow == n - 1)
+	/* no change */
 		return TRUE ;
 	else if( term.t_nrow < n - 1) {
-
+	/* new size is bigger */
 		/* go to the last window */
-		wp = wheadp;
-		while (wp->w_wndp != NULL)
-			wp = wp->w_wndp;
+		for( wp = wheadp ; wp->w_wndp != NULL ; wp = wp->w_wndp)
+			;
 
 		/* and enlarge it as needed */
 		wp->w_ntrows = n - wp->w_toprow - 2 ;
 		wp->w_flag |= WFHARD | WFMODE ;
-
 	} else {
-
+	/* new size is smaller */
 		/* rebuild the window structure */
 		assert( wheadp->w_toprow == 0) ;	/* proves coverity wrong */
-		nextwp = wheadp;
-		wp = NULL;
-		lastwp = NULL;
-		while (nextwp != NULL) {
+		window_p lastwp = NULL ;
+		for( window_p nextwp = wheadp ; nextwp != NULL ; ) {
 			wp = nextwp ;
 			nextwp = wp->w_wndp ;
 
-			/* get rid of it if it is too low */
-			if (wp->w_toprow > n - 2) {
+			if( wp->w_toprow == n - 2) {
+				lastwp->w_ntrows = n - lastwp->w_toprow - 2 ;
+				lastwp->w_flag |= WFHARD | WFMODE ;
+			}
 
+			/* get rid of it if it is too low */
+			if( wp->w_toprow >= n - 2) {
 				/* save the point/mark if needed */
 				if( --wp->w_bufp->b_nwnd == 0) {
 					wp->w_bufp->b_dotp = wp->w_dotp ;
@@ -616,29 +614,27 @@ BINDABLE( newsize) {
 				}
 
 				/* update curwp and lastwp if needed */
-				if (wp == curwp)
+				if( wp == curwp) {
 					curwp = wheadp ;
 					curbp = curwp->w_bufp ;
-				if (lastwp != NULL)
-					lastwp->w_wndp = NULL;
+				}
 
 				/* free the structure */
-				free((char *) wp);
-				wp = NULL;
-
+				free( wp) ;
+				lastwp->w_wndp = NULL ;
 			} else {
 			/* need to change this window size? */
-				lastline = wp->w_toprow + wp->w_ntrows - 1;
+				int lastline = wp->w_toprow + wp->w_ntrows - 1 ;
 				if( lastline >= n - 2) {
-					wp->w_ntrows =
-					    n - wp->w_toprow - 2;
+					wp->w_ntrows = n - wp->w_toprow - 2 ;
+					assert( wp->w_ntrows) ;
 					wp->w_flag |= WFHARD | WFMODE ;
 				}
-			}
 
 				lastwp = wp ;
 			}
 		}
+	}
 
 	/* screen is garbage */
 	term.t_nrow = n - 1 ;

window.h

@@ -55,7 +55,7 @@ extern window_p wheadp ;    /* Head of list of windows      */
  BINDABLE( enlargewind) ;
  BINDABLE( mvdnwind) ;
  BINDABLE( mvupwind) ;
- BINDABLE( newsize) ;
+BBINDABLE( newsize) ;
 BBINDABLE( newwidth) ;
  BINDABLE( nextwind) ;
  BINDABLE( onlywind) ;