Bump gocui

... and switch back from stefanhaller's tcell fork to the official tcell. This
basically reverts 7ccb871a45.

vendor/github.com/gdamore/tcell/v2/mouse.go

@@ -0,0 +1,103 @@
+// Copyright 2020 The TCell Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use file except in compliance with the License.
+// You may obtain a copy of the license at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package tcell
+
+import (
+	"time"
+)
+
+// EventMouse is a mouse event.  It is sent on either mouse up or mouse down
+// events.  It is also sent on mouse motion events - if the terminal supports
+// it.  We make every effort to ensure that mouse release events are delivered.
+// Hence, click drag can be identified by a motion event with the mouse down,
+// without any intervening button release.  On some terminals only the initiating
+// press and terminating release event will be delivered.
+//
+// Mouse wheel events, when reported, may appear on their own as individual
+// impulses; that is, there will normally not be a release event delivered
+// for mouse wheel movements.
+//
+// Most terminals cannot report the state of more than one button at a time --
+// and some cannot report motion events unless a button is pressed.
+//
+// Applications can inspect the time between events to resolve double or
+// triple clicks.
+type EventMouse struct {
+	t   time.Time
+	btn ButtonMask
+	mod ModMask
+	x   int
+	y   int
+}
+
+// When returns the time when this EventMouse was created.
+func (ev *EventMouse) When() time.Time {
+	return ev.t
+}
+
+// Buttons returns the list of buttons that were pressed or wheel motions.
+func (ev *EventMouse) Buttons() ButtonMask {
+	return ev.btn
+}
+
+// Modifiers returns a list of keyboard modifiers that were pressed
+// with the mouse button(s).
+func (ev *EventMouse) Modifiers() ModMask {
+	return ev.mod
+}
+
+// Position returns the mouse position in character cells.  The origin
+// 0, 0 is at the upper left corner.
+func (ev *EventMouse) Position() (int, int) {
+	return ev.x, ev.y
+}
+
+// NewEventMouse is used to create a new mouse event.  Applications
+// shouldn't need to use this; its mostly for screen implementors.
+func NewEventMouse(x, y int, btn ButtonMask, mod ModMask) *EventMouse {
+	return &EventMouse{t: time.Now(), x: x, y: y, btn: btn, mod: mod}
+}
+
+// ButtonMask is a mask of mouse buttons and wheel events.  Mouse button presses
+// are normally delivered as both press and release events.  Mouse wheel events
+// are normally just single impulse events.  Windows supports up to eight
+// separate buttons plus all four wheel directions, but XTerm can only support
+// mouse buttons 1-3 and wheel up/down.  Its not unheard of for terminals
+// to support only one or two buttons (think Macs).  Old terminals, and true
+// emulations (such as vt100) won't support mice at all, of course.
+type ButtonMask int16
+
+// These are the actual button values.  Note that tcell version 1.x reversed buttons
+// two and three on *nix based terminals.  We use button 1 as the primary, and
+// button 2 as the secondary, and button 3 (which is often missing) as the middle.
+const (
+	Button1 ButtonMask = 1 << iota // Usually the left (primary) mouse button.
+	Button2                        // Usually the right (secondary) mouse button.
+	Button3                        // Usually the middle mouse button.
+	Button4                        // Often a side button (thumb/next).
+	Button5                        // Often a side button (thumb/prev).
+	Button6
+	Button7
+	Button8
+	WheelUp                   // Wheel motion up/away from user.
+	WheelDown                 // Wheel motion down/towards user.
+	WheelLeft                 // Wheel motion to left.
+	WheelRight                // Wheel motion to right.
+	ButtonNone ButtonMask = 0 // No button or wheel events.
+
+	ButtonPrimary   = Button1
+	ButtonSecondary = Button2
+	ButtonMiddle    = Button3
+)