app: [X11] don't recreate EGL surface during resize

According to #565 X11 GPU drivers don't deal well with recreation of
EGL surfaces.

Thanks to Walter Schneider for debugging this issue and coming up with
the original patch.

Fixes: https://todo.sr.ht/~eliasnaur/gio/565
Co-authored-by: Walter Werner SCHNEIDER <contact@schnwalter.eu>
Signed-off-by: Elias Naur <mail@eliasnaur.com>

internal/egl/egl.go

@@ -15,10 +15,9 @@ import (
 )
 
 type Context struct {
-	disp          _EGLDisplay
-	eglCtx        *eglContext
-	eglSurf       _EGLSurface
-	width, height int
+	disp    _EGLDisplay
+	eglCtx  *eglContext
+	eglSurf _EGLSurface
 }
 
 type eglContext struct {
@@ -121,11 +120,9 @@ func (c *Context) VisualID() int {
 	return c.eglCtx.visualID
 }
 
-func (c *Context) CreateSurface(win NativeWindowType, width, height int) error {
+func (c *Context) CreateSurface(win NativeWindowType) error {
 	eglSurf, err := createSurface(c.disp, c.eglCtx, win)
 	c.eglSurf = eglSurf
-	c.width = width
-	c.height = height
 	return err
 }